Looking for a little more power out of a 318

Its almost completely stock, besides a cam (not sure of its specs) and dual exhaust. Noise isn't a concern, MPG is a little concern, would like to keep it in the same ballpark. Its a 74 Dart 2 door. Would like to reach somewhere near 350-375hp, without any machining or spray. The motor and trans were recently rebuilt. I'm thinking an intake manifold and headers for now. Anyone have experience with electric fans or water pumps? Would like to free up as much power as possible. Any comments or recommendations would be very helpful. Thanks ahead of time :rock: