C'mon if your building a motor, your hopping it up. Try finding good pistons, let alone rings for a 273 (rock still has them in STD, if your looking) . How about a 64-65 intake? Argh, just build a 318 and get a 'free' 80 ft/lbs more torque. IF you like the 273, put a 273 pie tin on a 318, no one will know but you and the 273 guy you beat. IF your starting with a 273-4bbl, you already have the pistons and the intake, might as well just get a modern cam and call it done. Not much I can say that will change your mind from a 273-4 to a 318-4 that I have not said already. Everything 273 fits a 318 'cept the pistons...and 2bbl pins.
