Right now I have a 200 I6 66 coupe. It's just plain slow, especially with the super-sloppy C4 I have. I'm going to be buying another faster vintage Mustang in the next couple of months. I'm considering this 65 fastback with a rebuilt 302. My question is... will it be enough engine for me, since speed is my main concern? How many HP / what kind of quarter mile times do you think I can get with a basic 4-barrel setup? What would the difference be between say a 302 and a 351 W?