i spent some time checking out these carbs and from what i've read and listened too, there very good carbs. the speed shop next to where i work swears that for money vs money, there the best buy. they have seen more horsepower on the dyno with a stock demon carb vs a holley carb that has been worked over. the guy who built my big block also swears by them, and he does some serious engine building. he also made the same comment about a stock demon. i'm a holley guy and i found it hard that someone put out a better carb, but they say, this could be the carb. but also, don't look past the holley hp series carbs, there suppose to be very good carbs also. they make a 750 in the hp series. might be something to look into ?