I have a 350 CHEVY in my 69 Bird,and it wasn`t that hard to put in.You have to put the Chevy motor mounts,bellhousing,and make a few wiring mods for the starter and reroute wiring for the alternator,but other than that it fits like a glove.You also need to use the Chevy power steering pump,if equipped.I used a SBC because parts cost way less then poncho parts,are easier to find here,and I have had a lot better luck with them.I just got the engine dynoed at 375HP and 487 Ft.Lbs. of torque,and it weighs about 200Lbs. less than Poncho engines.