[donkey77]

75 cj5 304,well what a cheap upgrade from the prestolite days i took some advice and got a 1979-80 distributor i believe duraspark, were can i get a ignition module for this and will my old coil work or do i have to get a new one
thanks

[CSP]

Get the ignition module at the same place you bought the distributor. These are regular parts store replacement parts if you're referring to either the stock Duraspark module or even using the new distributor with the GM HEI module. Jeephammer gave you detail on both I believe.

Don't be afraid of adding some detail to your posts when you have questions. It also helps to add your new questions to an existing thread so people can keep track of what info you have already received.

[JeepHammer]

If you have the Jeep/Motorcraft distirbutor used from '78 to '90 in Jeeps,
Then you will need cap, rotor, plug wires, and module.

Cap should be the large distributor cap used on later Ford ignitions.
It fits right on your distributor without modification, and gives you a wider cap to cut down on the spark energy jumping to the wrong terminal (Cross Fire) and the taller cap/rotor cuts down on the spark energy jumping to ground inside the distributor cap.

Here is a complete set from MSD p/n 8414,
http://www.summitracing.com/parts/MSD-8414/

Or you can buy the cap adapter, brass terminal distributor cap and rotor from a 79 Ford F-150 Pickup with 302 V-8 engine and it will all fit on your distributor.
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Then you will need a set of reasonable plug wires.
I would use these, MSD p/n 3119,
http://www.summitracing.com/parts/MSD-3119/
This is about the best plug wire for the price, and this is a 'Cut To Fit' set because no 'off The Shelf' plug wires really fit the AMC V-8.
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Next thing you will need will be an ignition coil.
For this, I would go to the junk yard and get an ignition coil from a fuel injected Ford vehicle from the early '80s to the late '90s.
Simply raise the hood, fine the coil wire, and follow it back to the coil.
Get the coil connector and the bracket while you are there...
I've never had to pay more than $10 for all the stuff to switch coils, and Ford used a VERY high quality coil in these vehicles.

If you go to buy one, try MSD p/n 8227
http://www.summitracing.com/parts/MSD-8227/
This is the highest grade of aftermarket coils I use.

If you need a coil connector, NAPA has one, p/n ICC1, $15.
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With modules,
You have a Choice...

1. The $20 GM HEI style module will trigger from the Distributor you have, and will drive the Ford style E-core coil just fine.
It's still a single fire ignition that is running 12 volts to the coil, but it will fire the engine reliably for many years to come if it's mounted correctly so it doesn't overheat.

2. You can use an aftermarket CDI module, (CDI = Capacitive Discharge Ignition)
And this module works differently than the factory style single fire ignitions.

It uses a bank of charge capacitors to feed the coil with a 400 to 600 volt supply,
And that reduces coil saturation times to the point where you can fire each spark plug 5 or 6 times for each firing cycle.

They work fine with the factory trigger in the Jeep/Motorcraft distributor,
And they increase your USABLE spark energy by about 500% (minimum)

http://www.summitracing.com/parts/SUM-850602/

http://www.summitracing.com/parts/MSD-6200/

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Now, here are some 'Gadgets' that might make the switch easier for you...

This is a wiring adapter that plugs into the Jeep/Motorcraft distributor so you can keep the factory connector, in case you have to change distributors or triggers...
http://www.summitracing.com/parts/MSD-8869/


And this is a 6 foot 'Extension' for the trigger wiring that will plug directly into the adapter above (and plug into most CDI modules).
The extension uses the CORRECT type of wire, the trigger pair is correctly twisted, and the trigger pair is shielded by a ground EM & RF shield.
This is a VERY good way to get the trigger signal from the distributor over to your module of choice...
http://www.summitracing.com/parts/MSD-8862/
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Here is a wiring diagram that might help you out some, it has part numbers, tips on other stuff also,

HEI stand alone,
http://www.civilianjeep.info/Ignition/HEIstandAlone/HEIwire05.gif

CDI stand alone,
http://www.civilianjeep.info/Ignition/CDIstandAlone/MSD-79-86Jeep.gif