it's pretty easy to tell an upper end problem from a lower end one by the sound, and the location... you may have spun a bearing or two, which would allow the motor to run but have a serious lower end knock...
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'72 short step, 350, 700R4, tilt, ps, pdb, a/c, lowered coils, etc., other work in progress... San Diego, CA
72 Stepside Project
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