True HEI distributor conversion thoughts

I once saw that big *** BATT' wire chaffed to shorted to the intake. Was a chevy pickup with a Autozone engine installed. Fried the wiring harness all the way to melting the fuse box, and killed alternator/regulator. Ironically, the owner who created this mess was a certified electrician too.
Toyota placed their coil on the distributer cap for all of 1 year ( 1992 I think ). If my memory serves, Heat related coil failures.