GM HEI conversion questions

There is no gain just using the GM module unless you use an ecoil or similar setup with it.
There may be some gain if you use a hotter coil, but you can do that with the stock distributor.
If you bypass the ballast resistor without changing to a coil made for straight 12 volts your coil will puke it's guts out all over your intake and die.
Either go MSD or HEI, not somewhere in between.

You can read this about the whole idea if you have not seen it already.
http://slantsix.org/forum/viewtopic.php?t=15779

If you don't have to have the lean burn for smog chk then the list would be,
GM ECU
Ecoil
Stock electronic distributor
HEI capable cap and wires
Different carb


If you have to have the lean burn then just put a hotter coil that takes a full 12 volts, bypass the ballast resistor and leave the rest alone.