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Re: Vacuum advance issues
I went through this last year with my pontiac, it had been upgraded to hei before I got it. I adjusted the timing and vaccum adv. several times and got it better but it never went away fully under load.
I realized they had used the old coil wire to power the hei which is lower voltage, I ran a wire from the fuse block that was a keyed 12 volt and it corrected all my issues. You need to make sure you have 12 volts going to the hei, this may not fix your issues, but it would be the first place I would start. good luck
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1969 CHEVELLE SS
1972 C10 ALMOST DAILY DRIVER
1968 C10 RUSTBUCKET (MISSION IMPOSSIBLE)
1972 PONTIAC LEMANS CONVERTIBLE (WIFE'S CAR)
"My wife and I were happy for twenty years. Then we met." - Rodney Dangerfield
"The difference between genius and stupidity is that genius has its limits." - Einstein
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