I agree with Shannon that you'll need to be clearer of just what noise is causing you grief.

I'll go out on limb and offer some suggestions based on my rookie experience a couple years ago.

Bear in mind that an overhead valve engine will naturally be louder than a overhead cam engine and some degree of noise is normal. In fact, valves that are too quiet means serious valve problems.

Valve noise can be helped by properly adjusting the valve lash and by installing an IPD cast-aluminum valve cover.

Aside from the valves there are all sorts of noises that ought-to and ought-not to be there.

If you suspect a specific area of the engine, take a 18-24" (45-60 cm) piece of garden hose or vacuum tube and use that to listen in to certain areas of your engine. Put one end to your ear and another to the area in question. I once found a significant intake leak on my 940 using this method.

Places to check first are:
Timing cover - listen for knocking or rattling
Water Pump - same
Intake manifold (head) - listen for sucking noises
Intake manifold (carbs) - same