i did this mod for less than 20 dollars.
junkyard Cap/Rotor from 1982-84 ford F-150 = 4 bucks?
Advance auto TFI ignition coil for 1984 F-150 w/ 302 = 14.99
Plug wires i took off a magnum 318 i had around... freebie
Mount i made with stuff... freebie
Did i leave anything out?
This 14.99 coil is the regular version, there is also a 40 dollar high performance version. my thinking is that if this TFI coil was good enough to come stock on 302's pushing spark for 8 cylinders, and for as high as a stock 302 revs... 55-6000 RPM... this coil should be QUITE adequate for supplying my 258 with good spark thru its 6 cylinders, which may see a top end RPM of 3500-4000.
it works fantastic, you couldnt imagine the results... im simply blown away - and its the first thing i recomend to anybody with a 258!!! were talking 20 horsepower, much easier starts... its quite ridiculous. for the money i used - the gains i got.
This picture shows the coil mounted in the original coils location - a setup i am not sure i am going to keep... Yes AMC engineers believed the location was not too hot for a coil - but nobody accused AMC engineers of making the greatest decisions either. I may just make a heat sheild for it with some aluminum siding. My plug wires are also from a V8, and their length makes this look alot messier than it has to. I hope this helps you.