[jrr]

Well I just tried them and the experience was great. I have a 4150 750 on a 351 crate. It is a problem child that no one seems to be able to fix completely. They asked a bunch of questions, then had me go out to garage. Had me look at whole set up and answer a bunch more questions. Asked a lot of questions on how I would use the car, where I lived and drove/raced [humidity]. About 25 mins of talk and listen.
I know SU carbs but not a thing about these things. I will buy a new one from them since the price for new is marginally more than having mine redone by them. If the results are like this experience..wow.