Your total mech advance, if I'm reading it right, is only 12 degrees total. I would try making your initial timing around 16-18 as long as it cranks over ok. Then see if it's an improvement.
If so, you need to have the distributor recurved to have about 16-18 total mech advance with 16 degrees initial advance.
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1970 GTO Judge Tribute Pro-Tour Project 535 IA2
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