I've had this happen on my A body and F body. Grind off old fastener and knock out of the frame. Drill out the hole to 1/2" and install a 3/8-16 steel nutzert. You won't ever have to worry about it again.
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Mike Iden
'66 GTO Post/468, 700R4, 3.31 7.25@96mph 1/8
'21 Chevy 4X4 Crew RST Z71
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