'73 Dart 5.7 Hemi Swap IAC Settings HELP

Supply it with switched 12V power and an ECU PWM output. If it makes too much noise, just turn up the frequency until it doesn't; PWM valves run at a pretty wide frequency range. If Holley allows open loop tuning (run X percent duty for Y temperature) start with that until you can get a stable idle. About 90% of "IAC valve issues" are with the fuel table or spark table; you can't use an IAC to band-aid something like too much spark advance at idle.