The last couple of motors I put together, while mocking it up I used a straw slit along its length and put it around a push rod and used it as a feeler gauge to check for any tight spots. A sharpie line along the straw helps.
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'71 GTO, 406 CID, 60916, 1.65 HS, '69 #46 Heads 230CFM, 800CFM Q-jet, TH400, 12 Bolt 3.55
'72 Lemans, Lucerne Blue, WU2, T41, L78, M22, G80
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