Take a look at my "new" Kohler K321AS I picked up for my Jacobsen GT14. Bored .010". Valve seats done. New Kohler top end!
The gentleman i bought it from made it a stand alone unit... Custom frame underneath - custom switch box for start and kill switch. Custom gaurds and gas tank mount. He was going to put it on a snowblower but lost interest. My Kohler is already .030 over and it is smoking. This should make a great replacement! Almost a shame to undo all the work this guy did to put it in my tractor!!