Ok fellas...318 help needed , Mpg , reliability and enough power ***for a big boat !!!

To start, get a 4 barrel intake on there with a spread bore Carb, TQ or QJ from a dodge truck or van or a Street Demon. Put a straight thru glass pack on the single exhaust. 340 style distributor and electronic ignition, new cap, rotor, Taylor Spiro Pro wires, and platinum plugs. Tune it to the max. Next step would be a cam, valve springs, Viton seals, and a double roller timing chain.