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well, i presume the head and the cam cover originate as separate castings (no caps; caps are part of the cover) then are assembled and line bored at the factory, at which point they are matched to each other. so, do what the factory does, but you have to go oversized and would need to insert some bearings to bring the tolerances back down to match the cam. presume bearings are no big deal; a diameter, width, and thickness?
just did something similar for the crank and cam on my triumph, where the bearings required are just based on the oem tolerance and how much you had to remove. but truly am out of my depth here so could be way off.
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