i have a 71 455 and i want to put it in my 63 riv. the motor is nothing fancy just got a mild cam in it. i want to know is the 400 the way to go? and if so what is the cut off year that i can look for at the junk yard that will fit it. i was gonna put a four speed on it that i have, but not quite sure hot to hook it up to the riv.
