Help me please tryin to beef up 318

4bbl, cam and exhaust can get you pretty far especially with gears which will smoke that 5.0L. 318 heads are pretty much a cork if you want over 300 hp. Magnum heads would be the best bet if trying for more hp. Me and my cousin have done a few of the 360 head swap and they've always seemed to work even though on paper they shouldn't and I don't believe in the ports being to large, 318 heads (originally 273) are to small more than 340 heads being to big. But with all the magnum choices there the best bet. If you need to go next level in 318 performance.