i would want the initial and total to be where you want them to be. Mechanical needs to be limited by narrowing the slot. I think total with vacuum advance usually ends up near 50btdc.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
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