Re: vacuum advance disabled
On the piston...just turn it 90 degrees and you have about 95% new surface. Check on initial timing, this can be checked with rulers, look up ruler method here. If adjustment is around center of slot it is probably ok.
Advance should start just a little above idle and come on rapidly. Brake slows down that process as a way of coping with ping from bad gas and/or bad driving.
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