many stock parts fit
my 71 250 aod swap went easy. came from 86 cougar 5.0, I got a tci constant psi valvebody,summit, $240.00 to prevent meltdown if
tv adjustment goes out. i wanted firm shifts and no skip shifts. nice 4-3 downshift getting off freeway. I bent my stock shifter rod to fit, cut my trans crossmember around the pan area, used donor car tv cable with angle steel bracket on my throttle bracket, cut my c4 front yoke [recess area] about 1".
rolled bead on oil lines and slipped hose connectors on. i had to buy a 6cyl aod flex plate $30.00, you'll need to check balancing
went easy