Which year truck do you have? I installed an HEI in my '65 Pickup and I changed to a heavier wire (actually shortened the wire out of the donor vehicle as it has the proper end for the distributor) and spliced it into the pink wire (I believe it is the wire that is "hot" only with the key turned on) and then heat shrank the joint. At one time I was under the impression that this feed wire has a built-in fusible link but I am not positive on that.
