Thank you for the additional information. Any chance the weights you have installed are for a clockwise rotation distributor? Do the Summit weights and the Petronix weights look basically the same? Happen to have some stock Pontiac weights handy to look at the profile or just try them? With the weights and springs off, does the shaft and rotor advance movement seem smooth and enough movement like a stock HEI? Hope this give you a few ideas to check out.
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