What he said... Its alittle tough and dirty but , if you jack it up and look up from underneather near oilpan, you wll see C6AE or D0AE etc etc. C6 means 1966,
Doae means 1970, if it reads D1 1971 etc etc, same goes for the C6AE , If it reads C8AE means 1968.. Ford made a 260 V8, then went...