im not real sure why you would put a 5200rpm limiter in it, if the bottem end is balanced correctly a stock sbc crank can spin to 6000-6500, just not for long periods of time, but this most motors, what cam would you use that topped out at 5200rpm, remember that if it is a cam that makes it power band to say 5000 then it will still make good power for another 500-600rpm, if you shift too earlier then will end up too low in the rpm band in the next gear, and get smoked, and when you run nitrous it makes you power band go up as well normally by a good 600-1000rpm so if you would normally shift at 5500rpm not you would likely shift at 6100-6200, you can run up to around 150 shot on "hypers" but the rest of the motor has to be set up for it as well, personaly i hate nitrous and when i see a car that runs it i tend to lose a little respect for the person using it, again this is my opinion, i will give much more respect for a guy running 10's on all motor than a guy running 9's on the bottle, i watched horsepower TV this weekend and they took a 05' bone stock mustand GT and put 125 shot in it, it went from like 250rwhp to 340rwhp, which is a lot, but think about the guy who built his motor from scratch and is making 330-350rwhp, which is around 420hp to the crank, now all of a sudden this guy who spent 500.00 bucks on a nitrous kit and put it on a stock car is making the samething, who are you gonna give the respect to and who are you gonna look at like a jack-whole IMO