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If your engine is all fine except for the studs, then just doing the studs is fine. They can be very difficult to get out though. Two of mine had broken flush with the case so I ended up splitting the crankcase to get them removed by a professional. I would also recommend changing the front and rear crankshaft seals, the oil pressure switch, engine breather gasket and thermostat O ring. All of these parts are relatively cheap. A leak check for the valves by filling the combustion chamber area with paraffin might be a good idea to see if all valves are seating properly. Grinding the valves in and replacing the stem seals is not difficult or costly but it would mean separating the heads from the Cam box which could otherwise be avoided. The oil return tube O rings should also be replaced. If there are any obviously leaking case through bolts, you could replace the O rings if you did only one bolt at a time.
Hope this is helpful!!
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