True. You ''could'' use a J.W. bell housing, around $600.'bout 8 years ago I put a 518 behind a 500''RB with their bell. Had to run a 10'' converter as the stock one (12''?) hit inside the bell that is thick. Cut off the smallblock bell and the J.W. bolts to the front pump. It worked but had at least $1000 in it when all done.There maybe other companies out there.