I'm likely going to have to pull the engine / trans to repair the trans from walking out of 4th gear. I think it is easier to pull the front clip and the engine / trans as an assembly.

While the engine is out, I thought I should reseal it by changing the oil pan gasket, rear and front seals, valve cover gaskets, carb gasket, water pump / thermostat gaskets, exhaust gaskets, and perhaps intake if it looks bad.

I'll pull the distributor and clean / inspect / rebuild as required.
I'll inspect the soft plugs and replace as required.
I may get froggy and consider changing rod and main bearings while I am in there.
I'll check oil pressure and compression before I do any of this.
Once I've tested, I may decide to only pressure wash and replace cover / pan gaskets.
The engine seems to run good, it is just real dirty and greasy.