If it was my own engine I would run a 55-60mm camshaft, over the factory journals. Probably overkill at the moment, but if you step it up later you don't have pay more $$$ to have the cam tunnel machined for it.
A vacuum pump can always be added later on, I would go with atleast a 0.043" top and second ring anyway, rather than the old school 1/16" ring.