I ran a wet shot with a separate fuel system,I'm not a fan of dry shots because nitrous is an oxidizer thus putting more oxygen to the motor,than you need more fuel to go with this or things tend to melt! On the heads issue: I had a freshened 406 that I put a set of ported 882's with 2.02- 1.60 valves.The truck went 9.60 in the 1/8th.I was dissapointed,and put a set of 462 fuelies with 2.02-1.60 valves,that being the only change,it went 8.80's the next time out,eventually I got it to go 8.60s with tuning.I think the smaller chambers helped, and the fuelies didn't have as much porting.I think the larger combustion chambers and too much porting hurt the motor. This might not be true for you! I personally haven"t heard too much good about these heads,but I'm sure others might say different.My .02 Good Luck