valve seats concerns T/A 340 Heads

What you have highlighted is why I mentioned there can be an issue with the intake seat install.

I had an x head here that had a couple of severely sunken intake seats.
Also, that head had some fairly prevalent core shift.
I got about 1/2 way into the 7/32” deep cut when a big hole opened up.
The head was no good without a seat........ so it was worth a try.