It shouldn't be a problem -- you're only going to *briefly* rotate the engine at the starter's cranking speed, which shouldn't throw too much (if at all) oil out of the oil box's holes (you could always throw a rag over the openings if you're fastidious); the intake manifold should be a non-issue. The only concerns would be if you had removed something that had a good oil flow into it, like the valve cover with a rotating cam throwing oil all over the place :-).