904 vs 727 Cooling Line Fittings

Pretty sure you will be fine, as the only difference I am aware of is the length to the rear line connection on the 727. (I think it's a few inches farther back)

When you get into the OD automatics the lines are 3/8 instead of 5/16 and the fittings for our cars have to be changed at the radiator to accept the larger lines.