All depends on what you are using it for. I have seen some MEAN full roller 331ci. These motors will twist 8000 over and over and still live. 400 hp would be fairly easy to obtain with a 327. However the torque will not be there as in a 350 or 383. If you are using it as a driver spend a little money on the cam and heads for the 327 and drive the wheels off of it. It will have more than enough power for the street. If you are going to drag race I am a firm believer in " There is no replacement for displacement" So go bigger than a 350. Unless of course you are going to spray then thats a whole new ballgame.
