That motor was used in cars up to 64,the early C-4 might have been made to fit that six. The fordomatics are similar to the later FMX,both trans have removable bellhousings so you might be able to take the bellhousing,flywheel and torque convertor from the fordomatic and use the later FMX trans. The reason I mentioned this is the older fordomatic starts out in second when in drive and on the later FMX when in drive it goes the normal 1 2 and 3