For the carb kit goto the B&S web site. When I did mine I bought the throttle shaft and bushing as well (not included in the kit) Also bought the magnetron ignition kit which is well worth the money. The Kohler engine may be better but the B&S has been bullet proof for me I'd buy another for the price difference.
Nice machine you have there pardner. I bought my first troy bilt the day after I rented a front tine tiller. Hands shook for about a day. You can't beat a Troy tiller. good luck and I hope you have a great growing season.