There is yet to be made a production 300cc+ American engine that can haul a 50% Edge, at 65-75 pounds, around reliably and with confidence, while light enough not to over burden the desired end result. People that know engines already know this.

I would not even begin to contemplate purchasing a "one off" product from a back yard machinist enthusiast. I'd rather let someone else put their $8,000.00 plus dollars on the experiment.