Coop,
The term "the best" is a subjective matter, to be sure. What exactly are looking for from your 350? How much power? Intended driving conditions?
Whether or not a stock fuel pump will be adequate is determiend by your power requirements.
The ram's horns ("center dump") with the 2 1/4" outlet are the "best" factory exhaust manifolds IF they fit your chassis.
Give more detail about the application.
Ji