I used the stock ign wire to power a 30 amp relay, use a late model fuel pump relay from the junkyard, put a 30amp fuse from the battery and run it to the relay then to the hei. Hei's use a bunch of amps, AND, if you do this you have really not cut up your harness, AND your whole ignition system is easy to see, troubleshoot, ect. Just a thought,, oh yeah, 10ga is a must.
