Head ? Turbo 318

Well when useing forced induction the heads don't really matter, because port velocity isn't a problem. Port velocity only comes into play when the engine is NA. IMO you'll want and need to run a larger port of the 915's, because you'll pack more in the cylinders, this being the case you may not need to run the boost as high. The thing that I'd be worried about is how long is the cylinders going to hold up with that kind of pressure.

Now if it were NA then the 302's or the magnum heads would be better choice.