318 heads. whats your route??

First of all the question would be how high are you planning on turning the engine? This will determine the port volume and valve size.

For street or street strip the std. 318 heads will be best with std. valve sizes. Then for high RPM's I would then use the 1.88/1.60 360 heads, as the port volume is 25-30 cc's larger from the factory, and the magnums are larger than this, with larger valves the valves being 1.92 and 1.625.