ok i have a 81 f150 w/ a 302. It was rebuilt b4 i got it. It will start and run, but when u go 2 drive it, it wants 2 hesitate and not really want 2 go. Its got a holly carb (brand new)that i put on it...i think its a 650(not sure)....new plugs,wires....and the timing is right, so i was told ...........plz help ...im at the point i want rid of it . Can sum 1 help plz.......