You can run about a 50 shot on stock internals provided your engine is tuned properly. Make sure there is enough fuel to mix with that nitrous. Also make sure there is enough spark. I would probably stick with a 30 shot to make sure you don't blow anything up. If it's not your daily driver and you plan on swapping motors turn that nitrous up and blow that baby, you can find out how much it can handle that way...
