It's hard to imagine going back would be better. A couple of things to make sure of is the oil hole orientation, that the adapter hasn't been tightened to the point it is flattened out too much, and the seal area is smooth. A late model adapter from any truck, or car after '62 with 292 should be trouble free. The C20E blocks are good ones for cores as well as accessory parts such as the oil filter fittings. If you can get a large wrench on the center fitting, take it off, clean the old gasket and area, check the adapter plate for being completely flat, make sure the oil hole is positioned like ford says on the adapter, and install the gasket with a good sealer, re-install the center fitting and torque down really tight, and it should be leak free. Make sure the oil drip is not from the oil pump tube, or oil pump, or pan gasket. Joe-JDC