Big horsepower 318 builds

replicaracer43 said
but I dont think its gonna happen on pump gas below 6000 rpm

Not likely at all. IIRC Jesse has built a 360 cresting the 500 mark @6400 and a 371 making 540-ish HP @6800. So you will have to wind a 318
to 7K at least. Good heads provided.