Both the crank and con rod are different by 1/4". Yes the bore size is the same at 2.938 inches so I don't know how you can bore your engine out and end up with the same diameter as the larger displacement engine.
You say your bore measures 2 7/8 but that equals 2.875 inches, not the 2.938 inches shown in the Kohler K manual. Perhaps you are not using the correct tool to measure your bore.
Why not stick with the 7 HP engine by purchasing a new con rod and getting the crankshaft polished? i don't think that one more HP is going to make a huge difference for you. Take the bore to 10 thou oversize, do the valves, make sure the head and deck or dead flat. Install new valve guides and springs.
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