The real GM HEI has it all in the cap. ONE 12v hot wire is all it needs.But the cap is really big so that limits where it can go. I have one in the 351M in my Ford truck. It has plenty of room since Ford in its infinite wisdom designed those engines with the distributor in the front. It seems I remember seeing some in A bodies, but only the 67 and up cars, but I am not 100% sure on that. Gettin old sucks.
