I do this set up all the time. Since i make my own flanges and intake/exhausts, and have the jetting all figured out for the 22mm slide carb, it's pretty easy. I also cut my own 245/255 cam. It's a really solid set up on either HS40 or HS50 engines. The only thing i really have to buy (besides the usual misc parts), is the billet rod. if i could figure out how to make one those i would...