Yeah, what Bryan said. I did the opposite, I installed an F engine into a K2 so had to remove the F's exhaust studs and install the earlier exhaust stubs and 8mm screws from a K2, but it worked fine. If you're only using the F2 header pipe you shouldn't have any problems as the engines are all basically the same, as is the position of the centre stand on an F2 compared to a K1.
