I would try to stick to a gap of closer to 0.040" With that small of a shot, you should be fine with that as long as you go 1 range colder on the plugs. Thats what I did with mine at that hp level.
For your application, having the gage on the bottle is fine. Just check it right before the run, and make sure you've got atleast 900psi. I ran mine plenty of times without a bottle heater, on cold days, and the pressure was like 700psi. Pig rich is all that needs to be said about that
If you haven't ordered the 5115kit yet, then check over on the corral classifieds. They go complete, sometimes with other stuff, for around $300.
Another note. If this is a 5spd car, you REALLY dont want to hit your rev limiter while spraying it. Yeah, the hobbs switch SHOULD take care of that, but I don't know if it can react quick enough. I have an MSD window switch on mine to shut nitrous flow off before I hit the rev limiter.
Just a thought to help keep your motor together
