Hi Trent : When I bought back the Street legal RTS that I had originally sold to the owner it had a 340 Kohler that was just rope start. So I went to a company in Crystal, Mi and they sold me a brand new Kohler 440 2AS engine with a electric starter. I had to weld a small strip of steel to the side of the engine mount for the wider engines footprint.
The are still in business and they are called Growth Products Inc.
And yes 6 K is ridiculous price even if it ran and was in top shape. I regret ever selling the one I built up and I sold it for $2500.00 plus shipping. That was back in 2006 or 7 don't remember.
Steve