We have the pro parts on the Duster and its a little old 383 with -1 heads which made up the deck height to almost what the stock 440 would be. The only tube that I had problems with was the drivers side rear. They told me to trim the steering shaft where the collar comes down about 5 inches. Other than that, I love them. I was limited to a 24" tire and now I run 27" .. More roll out