Never heard of a G9 cam, it is NOT a SCAT cam.
You dont need to have the case machined for the DT cam bearings. Just file off the tang off the second thrust bearing for it to fit.
sorry for the crappy pic but the one on the right is unmodified and the one on the left has the tang filed off

Also if you set the bearings in the case, fit the cam and tap the cam back and fourth with a hammer you will get the proper clearance. Ive been sanding the face like seth said for years and lately after I break down the engines for inspection the tolerance is too big. Tapping on the cam simulates the thrust load the engine will actually place on the bearings. If the tolerance is still too tight then sand a little bit. Also TAP the cam, dont beat on it like you are driving a nail!