I'm no expert on the rebuild/repair of HEI units (or anything else for that matter), but I found this website awhile back and it was extremely helpful.
http://www.rustpuppy.org/ignition2/Ignition%202b.htm, I agree with Larry in terms of the after market, low budget stuff - you get what you pay for - and that doesn't just apply to HEI's.
Personally, I get alot more satisfaction from fixing the old parts and keeping the original look, especially when the repair requires no special tools, very little jing, and mostly common sense.
Good luck.
