I've got an 85 K1500 that I'm installing an Edelbrock Pro Flo 4 system into. Part of the process is swapping out the HEI distributor with the standard distributor that came in the kit. My question is which one of the wires that was routed into the HEI distributor is the 12v switched power for the ignition? They recommend using that wire for connecting it to their switched power requirement, but I don't know which one it is. Thanks.