When I ordered my Bullet 75mm from Pro Flow, if I remember correctly, the little worksheet they give you to fill out asks whether you are running nitrous or not; either that or what your mods are. I think Mach 1 has the right idea, though. With the Holley SysteMAX II, if I remember the catalog ad right, it says 24 OR 30 lb/hr injectors will work. As long as your fuel pump can keep up, I don't think you'll have any worries with only a 50 horse shot and 24lb/hr's. Get a good regulator and gauge. Good luck!
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Capri306, Moderator, The Mustang Works Online
1979 Mercury Capri, 5.0L -- C4 -- 2.73
1987 Mustang LX Notch 