Another part you could look into is a progressive nitrous controller. Jacobs electronics makes the Nitrous Mastermind, which you can use to control timing retard only while the nitrous is flowing. You can also set a desired rpm for nitrous flow to begin, and a desired rpm to achieve 100% flow, kicking in the nitrous gradually. Or you could do what you said and have your standalone take care of the timing. If you wanna go above a 75 shot, you need to go direct port wet to take care of distribution problems.

Out here in CA the best pump gas we get is 91 octane, but race gas can be bought at tracks, and from VP.