The transmission, bellhousing, clutch, crossmember, shift handle, clutch cable, pilot shaft bearing retainer ring and driveshaft (check the rear u-joint flange diameter-you may need the one from the '74 diff or use your '72 rear half) are definites. The flywheel will not fit (8 bolt vs 6 bolt). I can't recall what the pedal brackets look like on the '74--with the change in the heater system they may be different. If the tranny has an od unit the switch on the column will be different. The relay is the same. Good luck with your project--it will transform your car.