Maybe pull the plugs and get a socket on the crank and slowly turn it, to feel hear a bad spot? You may put a timing light on it and make a mark on the balancer so you can duplicate where on the rotation it makes the noise and if its every revolution or every other. If you can, video it in slow motion, with the timing light, that would certainly help on "when" (in the rotation) you hear it.
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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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