I have a 63 C20 with a 292. One of the first mods I did was install an HEI, best an easiest mod I've done. I ran 10 awg from coil to firewall, didn't run 10 awg to ignition switch, I knew better. It ran great for 3-4 years. One morning I started it and the wire harness from ignition switch to firewall smoked. I checked for a short and could not find one. It only smoked the one wire and I was able to salvage the harness by replacing the one wire with 10 awg. Your mileage may vary!

Larry

I don't own a vehicle that isn't old enough to drink.