several places that you can go, jim carter, I got mine from RECARBO, I don't know how to hook you up to the link, just type in recarbo, I bolted mine on and never adjusted anything, I have had over a year. no problems and I drive my 52 halfton every day, it has a 54 235 eng, they can sell you dual carbs , anything you want ,I was real pleased with the service,good luck,,,FRED