I recently bought a x2 with a bad mod engine. I was thinking of putting a stock 750 engine in as a replacement to keep the speed up and increase the reliability. What do i need to do this? Does both manifolds bolt right on to the 750 blocks? Can i keep the impellor? Will i beable to run it with the 650 electrical unit and single carb? Please email me all input i thank you very much Cross4@excite.com