I hope that Dale can get some real good performance out of the 1250, my only fear would be the throttle bodies. The ZX12 is 46 mm, the Busa and GSXR 1000 are 44mm, (I believe), and the 1250 is 36 mm, which is real good for bottom end power but may limit you on top.
For the street, should be no problem, but competing on the dragstrip, it could be a killer.