The traditional V-8 path is well worn by generations of folks with lots of money and talent. It is hard for anyone to make a big performance increase there. The weak spot with them in NA form is breathing. Bikes are pretty much dominated by four valve engines with downdraft intake ports, updraft exhaust ports, efi, and the ability to rev well over 10,000 rpm. My bet would go to looking for an engine with good architecture that has these attributes. The way to success is to recognize and capitalize on things the other guys/gals have not figured out, yet. That is my advice, although I am a bike racer and have no idea what this engine would be.