You use the HEI module mounted on a piece of alum plate mounted seperately outside the dist or mount it on an alum plate bolted to the underside of the dist (hides the chebby part). Someone (eBay likely) sells the plate but it is pricey & you can make one easily. You'd use a regular round coil any type of your choice of ohms not the squarish OE one that looks like a transformer that fits in the HEi dist. I ran that with an Accel super coil the big yellow beast 30 yrs ago & it was a killer setup. You're supposed (per Accell) to run an .8 ohm ballast with it but at the time I did not know any better but it never burned out & ran like a scalded dog & with an aftermarket HEI module it've likely run even better. Speedway motors has an HEI "dynamod" and my setup way back used an OE black one out of a '75 chebby. dont forget the Radio Shack heat sink paste between the module and the alum plate for heat dissipation