I'll probably put up a video of when we finally fire the thing up. I've turned it on once with the broken HB, and the pullies make more noise than the exhaust!
There should be a woodruff key (SP?) on the crankshaft already. So, unless it is broken or missing, you don't need a new one. If you do...I'm not sure of the exact size, but I would guess most autoparts stores would have something suitable.....