Sorry, Auto cars use full vacuum at idle to the distributor. Stick cars use ported (only gets vacuum as the throttle is opened). Safer to not use vac advance. Initial at 12 degees 9 or 10 in the mechanical of the distributor for a total of 32 crank degrees. Semi stock Pontiacs love it. See page 11-33 of your Tempest shop manual. Put a degreed tape on your balancer so you know what is going on. Pontiac is remiss in not doing it stock.
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