It is still here. And it will remain indoors -- too good to leave outside. So no hurry. Are you sure you cannot use it on the tracked vehicle?
Indeed, they were designed to gobble up pavement at a brisk pace with a heavy load, and not slow down much on hills. But I cannot see myself scrapping it, just because it is overpowered! I really think a conversion to a small single carbonator would work. That, and a major down-gearing arrangement. For example, mount the engine sideways and use a chain drive from there. (Yes, I know, most motorcycles already have chain drive. But this shaft drive unit is what was gifted to me.) Or make a chain drive reduction between two drive shafts.