[denniskliesen]

Did you put sealant on the bolts where the holes go through at the back of the block? At least one goes through near the camshaft. Oil will leak through the threads and lock washer causing a leak. Another place you could have a leak is where the aluminum seal is on some of the aluminum seals had a gap that the main bearing cap left a gap allowing a leak. Especially noticed when engine shut off. Sometimes the shims will cover it and not be able to see and allowing oil to leak from between the shim and the block. You could also have oil leaking from the bolts holding main bearing cap. If the small freeze plug wasn’t removed from the main cap there could be a restriction where the tube goes into the main bearing cap. Too short of a tube on the main bearing cap can cause a leak. Here’s another place, the bolts going in the corner of the oil pan go through the block, seal those also.