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The outer hole of the pump arm retards the pump shot (it's further from the fulcrum).Leadlobber, will the vacuum advance hold applied vacuum?
Attach an 18" or so length of 5/32" vacuum hose to the distributor vacuum advance and suck on the hose, then plug the end of the hose with your tongue. Does the vacuum can maintain the vacuum or does it bleed off?
Timing can make all the difference in the world. If you ask me there is quite the learning curve with SBCs and timing. Read ALOT. bookmark whatever you have to for later reference