I have a 1976 f-150. With what I think is a 460 but I can't tell. I ned to rebuild it but I looks like it has 351 clevend valve covers on it so I don't know if it is a 460 or a 351. What is the easyist way to tell. And any suggestons on building the motor when I get ready to. I have built a big block befor. So I am nit really sure were to start to squease some more power out of the motor.