Had this done to my stock truck last year. What a difference in performance. Not near as good as a new fuel plate, but for the money, not bad. The only bad thing about was my exhaust temp's went up. Sometimes under heavy load, they would get high enough for me to back off till it dropped.
Mine was slid all the way forward, then about 1/16" back. Not exactly sure why myself, but the mechanice that did it said he has had the best luck doing it this way. At least on the 95's.