Hello , hope this helps. On that V8 engine on the L/S of the engine where the oil cooler supply and return lines connect. There is a plate which also holds the mount for the alternator. There is a gasket between the engine block and 2 "o" rings for the lines. The gasket between the engine block and mounting plate is a common spot for leakage. To see the gasket in question check on real oem and go to group 12 for engine electrical then click on alternator mounting. It will show the gasket that needs replacement. Its a fairly involved job thus the high labor low parts price. Good luck. Jeff