Converting to HEI, need 12v (Ign 12) source

Same issue when I custom-wired the underhood in my 65 Dart. I had ASSumed the IGN1 wire got power in both "run" and "crank" positions (why not, Mother Mopar?). I found the engine would crank and crank with no spark, then sometimes fire as I released the "start" position, exactly opposite the old "fires only when cranking" problem from a broken ballast. Finally figured it out. I just jumpered IGN1 & IGN2 together at the key switch, which you can simply do since you have a good wire to coil+ on IGN1, which is all you need. The wiring schematic doesn't tell you exactly how the key switch works, so only by reading here can you learn such oddities.