360 issues-need help!

Several things come to mind.. High secondary resistance in a wire or plug, carbon tracking in cap or rotor.... as far as timing goes.... as much as it will take and still start hot then figure how much over the top you are at speed and shorten the curve to the neighborhood of 38 degrees. You do this by shortening the slots the advance weights slide in. As far as vacuum advance ...this is just for part throttle cruise economy and should be connected to ported vacuum for mopar use. Total timing at part throttle cruise should not exceed 45 degrees on stock engines even less on hi comp units if used at all.