MII
The oil pan neeeds the notched areas to clear the rack and pinion, and its Mustang II specific as is the oil pick up tube (Unless you have a V8 car built in Mexico where the firewall was moved back). The motor supports are specific too as they have a different offset than earlier (pre 73) ones.. One side of the frame stand is the same, the other is engine specific. If you are swapping a V8 for a V6 you also need the transmission, or at least a bellhousing. Rear axles are the same, but you may want to change the front coil springs due to the extra weight. You also need a radiator and MII specific front accy brackets for alt/p/s, a/c. And the main wiring is different where the engine plugs in.