Matching numbers original 1985 Z28 purrs like a kitten. One thing that you might find interesting; I purchased a one piece Fel-pro pan gasket, but quickly realized that clearly the oil pump pick-up was a nearly impossible tast. Therefore, I spliced the gasket at the dip stick hole. Then repaired the splice with black Permatex silicon sealent. ZERO leakage. All other gaskets utilized on the project came from Cometics. Cometics gaskets are viton rubber over a metal core. Pricey, but again no leaks