scooter mark is dead on.take his advise.i use to run qjets back in the day. i was one of very few who really like them. one you have them dialed in i believe you couldnt beat them. track or street.with my holleys i was always dialing them in for different conditions.but with my qjets once i had them they seem to stay. never had to dial them in at the track even after runnin them on the street.and my times seem to stay consistent.once you build one they are really easy to build. atleast for me.