Bob's HEI ignition is about as "trick" as it gets! With all the aftermarket improvements available for HEI ingnitions, his modification for use on the mopar flatty makes the sky the limit for increased performance in that area.
My dad used a Petronix magnetic trigger type electronic ignition in the stock distributor. Works good, but has a very limited range of operation - about 16 degrees. He has the vacuum secondary off with the spark plate bolted together. With a few modifications on a points based setup, I can get about 40 degrees movement without the vacuum. That's not possible with the electronic due to limited pickup range in the magnetic field of the trigger.
Petronix is supposed to have a new "dual dwell" system out there to remedy this problem. I'm curious to see what improvements they employed to do this. If memory serves, I think the new setup will accurately allow up to 32 degrees movement by mechanical advance only.
Since I have seen Bob's HEI - my thoughts are changing about the "little" distributor. I may have to go High Engery myself.
