Installing nitrous on DD for track use only, what needs changing?

If I wanted to put a 75 dry shot on my setup, just for track use...what else should I do? I run 15* advanced now, so before spraying at the track I will have to bump my timing down to 10*.....which is easy enough. But what about plugs? Will I need to put colder plugs in? Will I have to change the gap?

I wouldn't be using the spray all that often, just for the times I go to the track, so I really don't want to run around with 10* and a super cold plug gapped small all the time......but I really don't want to change plugs just for the track. If I do install this kit, I will only use it at the track, and most likely won't even use it every run.....go make a few passes on motor, then a few on nitrous. So changing plugs at the track would be a PITA. Taking a little timing out wouldn't be that big of a deal.

So, can I run a 75 dry shot with my OEM plugs gapped at .045, or do I need different plugs to make 4 passes? And is 10* advance where I want to be for nitrous....just bringing it down to 10* from 15* for my nitrous passes and putting it back at 15* for DD and non-spray passes?

I appreciate it, but IF I go with this, I am going with a friends kit. It is a -ready-to-go 75 dry shot. I wouldn't spend a lot of money on something that I am only going to use at the track....which is like 4-6 times a year. Which is why I never really thought of installing nitrous, because it would make no sense spending that much money on something I will hardly use. But a free-be 75 shot...now THAT I will use. I just don't want to have to go changing things in and out just to make a few passes. Like I said, changing timing is a 2 minute job that can be done at the track. But I do not want to change plugs on a nice and hot motor, at the track.

Would there be any negative effect on my DD setup if I ran a colder plug, gapped around .040?