That looks like a Tomberlyn Crossfire 150 ----would think you best bet would be a chain driven engine with a jack shaft ----go to buggies gone wild forum and then to the build projects , you will find many builds ----- I was going to do the same style if not the same cart with a 200sx engine , but water got into the tubes and rotted out the frame ----I have another cart project on the burner , a EZGO Workhorse with a 300 shaft driven drive train , it is about 3/4 finished ----I can show you some pics of the jack shaft I had for that cart , it was a single chain to the shaft then double chain to the axle , I still plan on using that set up on a Club Car electric cart conversion