Saw a few other forums that didn't seem to wanna be bothered answering questions or helping people. I have an older murray explorer with a predator 212 on it.
Posted some pics to my profile album. I just broke my clutch so there's a pic of it in there and a pic of how we did the throttle. I have a spring run from the throttle to the muffler for now just so the throttle doesn't stay open. It's a fun little cart and runs about 35 mph.
I've done no mods to the frame. Just swapped out the 6HP tecumseh power sport with the predator. Not too much more power or top end, but loads more torque.