I'd check the integrity of the harmonic balancer and whether the threads in the crank snout are intact. If the key isn't the right size, you could have symtoms like this too...
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'95 RRC LWB, '05 Suburban Z71 (not stock), '94 F350 (only the cab shell & rear bumper is original), '62 International 404 tractor (red & white) & many other project cars in the past!
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