I've installed a few on various customer cars, they work quite well! As with any of the Edelbrock's, takes a bit of tweaking to get them right, but they sure do hold a tune well once set up and calibrated properly!!!! One I installed is on a brother-in-laws pickup, 2wd chebbie, 383 stroker, roller cam, Edelbrock heads---was talking with him on Saturday, he mentioned the truck had 20,000 miles on it since he built it....if there were any problems with the carb I sold him I'm sure I would have heard about it by now!!!!!!!!!!!!!!