oh one more thing. I had originally tried to use the pitts style muffler and along with the problem of the pipes exiting the cowl wrong I couldn't for the life of me figure out how to run the trrottle rod. There just wasnt any room between the head and the muffler you might need a spacer. If youre not totally against it I would consider the other muffler that I mentioned. Other adjustments I needed was to enlarge the slots in the motor mount also sanded off the lip on the motor mount where the anti vibe screwed fast. I still had to use a clamp to hold the mount far enough apart to stuff that big engine in. Not a problem if you turn the engine to 90 degrees just take it into consideration before drilling the holes.