With the Pertronix installed it advanced the advance plate. Now that the points are back in the plate is probably where it should be back in it's stock position. I still say the mechanical advance is coming in too soon/fast. Once you get the timing back to 6* BTDC drive it & see if it starts breaking up again. If it does then dis-connect the vacuum advance like I said above & repeat. If it's OK now my theory is right about being too fast on the mechanical.
Tom T.
Tom Telesco
Classic and Muscle Automotive
12 Cook St.
Norwalk, CT 06853-1601
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NailHead Mini-Starters '53-'66
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