I have a bellhousing that has the part number AC 6394 D on it.Its different from the 55 56 that i have.the difference is that the flange that the flywheel cover bolts onto is flat,not tapered.It also has a plate on the inside flange with two holes for the starter to bolt on.Couldnt find this part number in my 55 56 manual,maybe 54?(standard shift)

Carl