oaklander

My late 1988 2WD truck with 2 BBl Carb and 22R engine with 150,000 miles just started to leak a little after sitting for about 6-8 hours. It seems to leak about 6 drops of oil and drips below oil drain plug area. The drain plug is tight and the oil is not coming from that or the oil filter area. I dont see any wet oil above the valve cover gasket and most of the wet oil seems to be on the carburetor side of the engine toward the lower part of the engine area and it seems to spray onto the alternator area. Any advise where this leak could be coming from? I dont see any leaks when the engine is on. I dont really even need to refill the oil because I lose so little oil during this leak.