I am up to 90's and 94's in my HP950 Holley. Factory jetting in this carb was 78's all the way around. This is on an 8:1 468 Chevy with Team G intake, little oval port heads and 302/544 Crane cam, in my 18' v-drive. Motor is running better, but still has a miss at WOT (46-4700rpm)and the plugs are still white. I added raw fuel to the engine at WOT with my nitrous (fuel) solenoid, and the miss went away, but I also lost rpm, of course. You would think that adding that much fuel to it would make the plugs turn black, right? Wrong! They were a nicely colored greyish tan. That makes no sense, now does it? What do you guys think?