68 H-code 'cuda - needs just about everything
Look for a block that has two bosses on the front of the engine just above the oil pump. There were many mid 60`s C-body cars that had those same bosses on their engines. You can drill and tap them if they`re not already done. If your car is an automatic then the driveshaft you`ll need is going to be very rare indeed and getting one custom made is likely your only choice. If it`s a 4spd. you should be able to use one from a small block or big block car but that would still be hard to find. Big blocks also have a specific torque shaft as well. 727 transmissions do have different tailshafts and I think it`s the short shaft that used in trucks and you`ll need one from a car. Get a radiator from a 67-69 V/8 equipped car with A/C and you should be fine. Check out Schumacher Engine Swaps for motor mounts and a set of headers that won`t break the bank. Original manifolds are rare and expensive. Keep us posted on your progress.