Its showing the bodies being the same for 600-800 cfm.....Odd. Is the jet sizing the only difference? I would think the body would be bigger for the more cfms?
If I recall correctly, the main body flows something like 830 cfm. Yes, it is the same one for multiple applications. When I did mine, I had to go up in jets quite a bit, but if you don't mind carb tuning it works out well.
Again, if I recall correctly, the 650 and 750 use the same base plate, that's why it works.