We would need a whole lot more info to even make a guess. Fresh motor with no miles? Has it been broke in properly? What heads, intake, carb, cam, pistons, etc? If it's been run, how many miles are on it? Just street miles or has this engine been drag racing? Same questions for the transmission. What all was done to it? They will have a rather limited market, especially the transmission as it's technically a one year only transmission as a stock application. It will bolt into the earlier A-bodies as a V8 replacement however. To put it in a '65 might require some valve body linkage changes/modifications.