K. Well I don't think that 300 horsepower will be obtainable as the 318 cam is small .373 x .399 / 240* x 248*. Compression is like 8.5:1, intake ports and valves are small. If he uses a set of 302 heads that would help, I don't know if there is a 2 barrel intake manifold for the magnum heads. If he has to use the factory induction system and cam, then I really don't see 300 horsepower.