7 1/4 rear. need some guidance

the guys here tell me i have a 7.25 rear axle, sure grip. it has 9 bolts on the cover. I am reubuilding a 1966 barracuda, probably go with a crate 360, 300-350 hp. it has the factory 4 speed tranny. is this enough rear end for the combo. I drive easy, most of the time, but would like to get on it occasionally, whatcha think....