me and my brother used a box stock holley 750 in our unlimited auto-x car for 2 years without any problems, we now run a proform 750, with with a machined choke horn, billet metering plates, billet base plate and a few other mods, which I'm not at liberty to say. As long as your floats are adjusted correctly and they are full width floats, you shouldn't have any problem, unless your turning like 2 g's for seconds at a time.