A518 verse 727 transmission question

Well a 355 rear is not that "short" so no I don't agree with that assessment.

Another factor........not being familiar with those "southern" cars........is an A518 OD won't fit up under the A body crossmember without major upper crossmember (the part welded to the floor) AND floor surgery. There are several threads on here about putting A500 (904 based) and A518/46R transmissions into A bodies