Right no PCV valve just a road draft tube and yours looks to be blocked off. This is very bad. I would install a PCV to clear the internal engine vapors and burn them thru the carb. Right now you are building sludge inside the engine on all surfaces.
Engine will be much cleaner if you run a PCV valve.
Valve job will be much cheaper as you can just pull the heads. Unless you have done a compression check I would do the heads first and see how it runs and drives. Yes install hardened seats (Good idea) but really focus on the valve guides and valve stem seals. Install bronze guides and DO NOT knurl the guides as that is a short cut and not worth it even though it will be cheaper than a new set of guides.
Be sure and cut the head surface to make sure it's strait. It's nice to also surface the intake manifold surfaces but that gets expensive to do and I usually don't unless I have really shaved the heads and the alignment is off.
You really don't need the hardened seats unless you run the car hard which us Tbird guys don't. We are cruisers!