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Back in my auto parts days a p/n2250 starter fit all bigblocks except HEMI.
Do you have the cast iron bell or the aluminum bell?
The cast iron needs the 143 tooth flywheel and the aluminum needs a 130 tooth




Ron there are also cast iron 130 tooth bells prior to 1970, but a 70 should have the alum. one.




John your right, I usually don't speak about those little engines (383)just 440's.
And I believe the mind is dusty on that part# I through out there, may have been 3250 starter.
Ron




The only difference between the starters is their torque rating, the nose of them that bolts to the bell or the auto trans is the same.

He still hasn't said what starter he is working with.? Even though one of the mounting holes is bigger than the diameter of the bolt going thru it the starter snout pilots into the bellhousing so there shouldn't be an alignment issue. If he is working with a starter without he pilot snout that could be causing the issue .