If you did not change the flywheel or starter the only thing it could be is a bad starter or the spacer between the motor and trans was not installed. If the teeth were worn on the flywheel it would just grind it wouldnt stay ingaged.I also never heard of a 180 tooth flywheel if its an automatic it should have a 157 (big bell) or a 164 (small bell) there is a smaller flywheel but only in mustang 2,s.I found this out when my brother n law's 71 mach1 starter went bad. it had an 302 but it also had a c4. well i was rebuilding a cleveland that had a new starter and c4 so i let him use the starter and it did exactly what you describe! It would make an awful niose while starting but it would start then the starter would stay ingaged to the flywheel! thats when we found out there are 157 tooth and 164 tooth flywheels. My brother n law goes and buys a new starter and again it does the same thing!!! it turned out to be a bad starter and was brand new. so the next starter done the trick. I hope i have been of some help.
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