Understood. You can DIY convert a small cap OE GM points dist to HEI using OE parts. Or you can pay DAVE RAY to do it. He uses an MSD pickup & reluctor but those are simply OE Ford pieces. The GM 4-pin module mounts external (not unlike a 1998 GM V6 L35 or V8 L30 or L31 pickup truck). Module's better external anyway because it'll run cooler. FWIW, both GM 4-pin module & Ford trigger are dead nuts reliable in day in-day out traffic & race. FWIW --- many times, when some guys get into ignition trouble, it's often due to choosing a coil that's an incorrect impedance match.Can’t run an HEI. No firewall room.