Depends on how much "hands on" you want to get with it. The B/S flatheads can obviously be made to fly... depends on the amount of $$$ you have.There is TONS of knowledge available for getting more performance out of it on The Web!.... On the other hand, if you want a new motor that runs beautifully out of the box, and will accept mods down the road, I'd go clone. I have 3; -not one has given me any problems, and they're pretty quick. Some guys have yanked the governor and ran them (within reason) without a problem. 2 cents.