Pro-Systems has a 1600cfm dominator conversion they do. Huge throttle blades added, venturi mods, booster changes etc. they do work. But, they get $1600 plus your carb. They can also do milder versions for less. I wouldn;t hesitate to call APD either, as Hammertime suggested, their carbs work very well. One of my customers is debating sending his 1250 to Pro for that conversion, but, its a money thing with him also. Patrick said he GAURENTEED him a minimumn of 35hp, and said he would refund his money if it didn;t make that diff. He said, also, on his combo, that it could pick up 50. Its a 598 Big chief deal. Those are the engines that really wake up
Frank