[aerotest]

Mine is fixed vacuum advance but I run 12 degrees base with 36 total and all in at 3000 rpm on a stock 396. It runs great and really woke the engine up. Make sure you are on pure vacuum and not ported vacuum for the advance to work at idle. You can use an adjustable timing gun to measure the idle advance and adjust it to your liking. Normally it’s +14 over total timing.