I once converted a '63 Catalina automatic car to a four speed and could not get the pilot bearing to go all the way into the hole in the butt end of the crankshaft due to the step part way down in that hole. The four speed trans would not bolt jam up to the bell housing because of this. The car was on a lift. I took a dremel with a round stone on the end and ground that step out and the pilot bearing then went all the way in and the trans bolted up. You might try the dremel thing.
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