My best luck has been with Duraspark, hence my recommendation... but I know lots of others who've had great results with HEI, DUI, and Pertronix as well. Between my '71 Mach 1 and 4 Jeeps that I've worked with over the years, Duraspark conversions worked best for me.
I'd tried doing the stealth HEI one day (using my stock AMC Duraspark box) - emptied the box thinking it would be a simple thing, loaded up the HEI module and ran the wires, and it wouldn't even fire... plugged a new DS box in, and I was on the road after wasting roughly $50 on an HEI module, new DS box, and a whole day fartin' around with HEI.
My '78 K5 Blazer's HEI just quit working one morning on the way to work. After the whole morning of troubleshooting, learned that carbon build-up in the distributor cap HEI module cradle interrupted the ground and shut the car off. Fortunately, it was an easy fix, and carrying around a spare HEI module is a LOT easier than a DS box.
Pertronix would actually be the easiest, not requiring replacement of the distributor.
DUI was ridiculously expensive when I first looked into it, and every HEI distributor I've seen installed has chewed up the cam gear. Granted, those might not have been the best-sourced parts (either Amazon or ebay, can't remember). One thing I did learn, thanks to many folks here with great advice, was to pull the distributor gear from the existing dizzy and slip onto the new one - eliminating any possibility of a newer, harder gear chewing up the older, softer metal.
That's what I did with the HEI dizzy that came with my Pro Flo (swapped the dizzy gears). I'm hoping my luck with HEI distributors doesn't persist, since the Pro Flo ECU controls everything.
Hopefully though, KWGW can get his engine to at least fire up with the points and all the excellent advice so far.