Eddies Vs 915 J's

I don't think you would gain much switching heads on a 318 like yours, maybe 20HP tops. If it was a strong 360 or stroked you would see a bigger gain. I wouldn't bother with a 2.08 valve even on a stroked sb. The 6 pack would work better on any setup properly tuned until you get up over 5,500 rpm then it starts to fall off but it looks way better than any 4bbl set up!!!