[78w72]

Im late to the updates on this but what I would have suggested when removing the pan is to inspect things 1 step at a time before pulling the main cap & rms... when you first pulled the pan off that would have be the perfect time to look around the rear pan seal to see if any oil was in that area or how it was sealed up. Did you happen to notice that when the pan first came off?

As for what to do with the motor, I dont think doing some basic machining like honing for new rings & checking line bore etc with new bearings and rms would cost anywhere near a whole new rotating assembly at $2800 + shipping/tax, that would then require the same machine work & cleaning of the block or a new block. Your engine runs or ran great beside the leak... if it were me I wouldnt abandon that block over a leak that can be fixed by a shop that knows what they are doing or has done lots of pontiacs. There should be other good shops in your area or within a couple hours drive time. Just dont want to see you open a can of worms to get a new block & start from scratch or buy a new rotating assembly when your parts/block are or should be perfectly fine to use.

Hope you get this figured out