Other things noticed...
1. leak on the side (side cover) could be from a couple possible culprits... the side cover gasket (cork) is done and will require removal of the distributor (dizzy) to put on, could also be the that the nuts holding on the valve cover are loose and allowing oil to seep out, could also be that head gasket is leaking somewhere back there and allowing oil out.
2. air cleaner that is on there looks like a weber??? Do you know if the PO changed the carb out with something other than stock Aisin?
3. Heater valve (about 9' o'clock in the blowby pic) seems to be leaking from both hoses which could mean you have excessive pressure in your system or the hoses are old enough that they BOTH (upper and lower) need to be replaced. Check the valve for proper operation using the heat switch on the dash, the pin at the top should move up and down pretty freely when you move the switch from hot to cold.
4. Truck has been desmogged (again leading to the weber thoughts) so it would be a good idea to find the 60 desmog thread and go through all the hose routing to ensure everything is connected properly.
5. Looking at your last pic I see a lot of oil splatter on the underside of the hood which goes along with the blowby. Do you have records/receipts for the engine rebuild that came with the truck?