If it's been sitting around any length of time, even a week, wih the jug off, and the crankcase internals exposed, as that pic shows...then it needs a complete dissasssembly FIRST. Everything must be cleaned. You'll be cleaning stuff out you can't even see, but it could destroy your engine prematurely.
So step 1, you asked for it, remove engine, dissassemble to last nut and bolt, CLEAN everything with mineral spirits and compressed air, buy some new gasket and re-assemble. Besides, if it was run without oil, your crank bearings are at best questionable, and the crank unit should be replaced, as should the oil pump.
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kliff
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