My last builds was a high compression npi 2v. I wanted to see how the 5.4l 2v would respond with zero deck pistons, so I sourced a set of 1.330 comp height pistons that made the static compression 18:1 and I ran E85. It ran ran great, but was a tad bit to snotty. After running it a bit, I realized high oil consumption. Pulling it all apart I found the 2nd piston ring was fluttering. To make things quick, I just reinstalled stock flat top pistons, significantly reducing the comp ratio and being a little more gas friendly and more importantly piston to wall clearances. The high comp piston I was using was sized for propane fuel racing, which in turn is a different shape and size. I didnt know that then, but I learned. Anyway, long story short, running the npi ported heads, comp274 cams, edelbrock intake I had to set the rev limit to 6500rpm and the power was great. My guess-ta-mation of power by racing other know cars was in the 350rwhp range.