magnum and a 727

does any one know the correct combination. i want to put a 360 magnum up to a 727 but still utilize the oem computer flex plate. i put a injected 360 in a 75 power wagon a few years ago and all worked well but it had an overdrive trans. but for my car i want to just use 727 and run a Manuel trans pcm and a magnum 360 what is the magic torque converter flex plate combo
Thanks