Just thought of something. Pull the distributor, and watch the cam gear as someone is cranking the engine over. it could be out of round, and the noise you hear is the oil pump shaft hitting the hole in the block. For sure check the lower distributor bushing , see if its tight or loose again. I know Paul checks the cam for being straight, but I doubt he would check concentricity of the gear. Maybe the gear isnt cut right, like one of the grooves not deep enough. Really look the dist gear over and see if its worn abnormally.
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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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Bill Nye.
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