To start with, you should not have so much oil vapor that you need a catch can on normal operating PCV valve system. The early 283's used a can under the intake to limit oil usage, but that was just the start of the PCV usage. A simple baffle is all that was used after the can was discontinued. The inside of intake should be coated with oil if the PCV sucked it in.
A quick hone, new rings, gasket set, and valve stem seals should get you back on the road. Use a dial indicator on the valve stem while you push and pull on the stem inline with the indicator, this will give you an idea of how tight or loose they are. Could be the seals just dried up from not being used for three years, rubber is not what it used to be. I pulled a Pontiac apart that was using oil real bad, found all the intake seals stuck to the stems and riding up and down as the valves moved. On the down stroke, they acted like scoops grabbing up oil and shoving it into the guides. They were the wrong size to start with.
Keep all the bearings in order and on the same rods / mains, no need to change out new parts. A quick wipe with a clean towel and some assembly grease is all thats needed. Careful with the rear main if you pull the crank to hone. If you don't pull the crank, pack the bottom of the engine with towels to keep the hone oil in the cylinder, then super clean each cylinder as you go. It won't take much too rough up the bores a little, the new rings will need something to bite into.
Did you use Moly rings or cast iron? Moly is all that I would consider.
