valve seats concerns T/A 340 Heads

Uuuumm..... yeh.

Doesn’t look like there are intake seats, but the intake are sunk pretty far.

The punch marks and hammered lip around the exhaust seats are a sign that maybe the installer wasn’t confident that there was sufficient press fit to keep them from falling out.
That’s some pretty ugly work.

See if you can get a reasonably close measurement of the exhaust seat OD.
The normal size for those heads is 1.687”, but I have seen people use 1.750”.