When I said it was "probably 120 something tooth" I meant 120-129 tooth. Not 120.
So 122 tooth. This never had a clutch on it. Had a drive plate bolted to it.
It's not the tooth count that makes it not work, although with a car slant bell housing, the 122 tooth is all there's room for, it's the crankshaft bolt pattern. The slant 6 has a different pattern.