HEI conversion Dodge ram truck coil

Rick,
Yes GM [ & Ford ] went to larger caps. In GM's case, the bigger cap was needed to house the new E core coil. I have run HEI ign with small cap dists, no problem.
With the GM HEI cap, I have run 0.125" plug gaps. Just to see what happens.....
Nothing happened that the butt-meter could feel.