I only have limited experience with the gas, and that was with a blower+meth before it kicked in. Had a Harris Speed setup, tore it out, went with a standard MSD window, WOT, and a couple other inexpensive things to complete the kit. I traded out the fogger for a plate, but not sure that was needed. It never really did anything on my car except give it a nice kick on the top end, but the ET was really gained since I dumped so much timing early on and only kicked it in during the top end. My fastest MPH in the 1/4 and 1/2 mile were without it.
Now my car is NA with the plate hooked up, but haven't tested it. I would take the advice of the nitrous gurus here, especially Tim. I've kept track of his results here and on other boards for a decade or more even though I don't post on them.