A 50-75 shot will work fine. Just use the TR6 plugs like Jeff said and retard the timing 2 degrees when you spray. Rule of thumb is 2 degrees for every 50 shot. The window switch will help save the tranny and give you a little more comfort. I was pushing a 150 shot without a window switch but I could afford a new tranny if I screwed it up. It's you choice. LOL the higher octane will help out also but you'll be fine on 93 octane. You're putting one of the safest shot amounts on your truck. A good friend of mine is spraying a 100 shot with just TR6 plugs and it's a 2000. We installed our nitrous at the same time which was back in 2000 and his truck still runs fine. We must have gone through 20 plus 15lb bottles of juice on the street and never once got pulled over. LOL

Good Luck!