GM Coil and Module Help Required

Dave,
A lot of the problems you mention in post #8 never eventuated. I have the original GM info they released on HEI operation. Yes, different ign coils for Chev, Pontiac [ & different p/up coils ].
However, replacement HEI coils such as the MSD #8225 fit all in cap HEIs. Different p /up coils, yes because of CW & CCW rotation.
I did read that GM had concerns about the magnetic field from the starter interfering with HEI operation during cranking but I believe these proved to be unfounded.
For any body who thinks points are great & are all you need, the document states that HEI has 40% more voltage output & 85% higher energy level than conventional breaker points to "fire lean fuel mixtures even under the most adverse conditions".