I already have one kart with a lightly modified 212 hemi that I left the governor on and it is plenty of fun but I recently was gifted a second kart from a friend and and wanting to build a more aggressive motor for it, it's going to be used off-road with some decent hills so I'm wanting to go torque converter over centrifugal clutch but I'm having trouble figuring out what set up to get, I'm hoping to shoot for 6000 rpm and about 15-18hp so I know a 30 series is out but what other options are there for a 3/4" crank without breaking the bank