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There are 3 lengths of cam ends on the dist.side. With the adapter it will make up the dist approx. 7/16 on an inch shortness. That would would with the earlier cam length. Then the other version that would require a buttom adapter. The final cam would require nothing. All Ford flathead cams will interchange. The problem lies iin the timing cover . block and dist.
As stated before Dick Spadaro carries the dist adapter, contact him for what you need .
Good luck Bill