A quick update from my side (OP). I got a partial shipment of parts and was able to seal up the coolant system. I did a pressure test of the coolant system and it is holding pressure at about 15 psig. This is encouraging for me!

I also flushed out the one coolant channel that exits the block right above the alternator with a small diameter hose connection. I connected all the other coolant hoses and the branch from the upper radiator hose that connects to the that block connection, I sealed the branch with some pinch pliers. I connected a hose to the connection on the block and filled the coolant system through the expansion tank. I did get decent flow through that block connection even with just hydrostatic pressure.

My next step is to add some radiator/coolant flush solution to the system and let it run for a little bit then drain, flush and refill with coolant.

I also tested for OBDII codes with my foxwell scanner. The only code I had associated with engine and transmission is a pending code for high coolant temperature.

I'm still waiting for my replacement fan, so it will be a few days before I take it for a test drive.

Thanks!