Spark plug thread inserts., Should I be concerned? Options

[Erben914]

I have my engine out for a bear tub restoration. I am reassembling everything and almost ready to put the engine back in.
As I was cleaning things up replacing the tube seals and getting ready to adjust the valves I found these threaded sleeves in my spark plug holes.
Looks like a PO was a DA?
Did they strip all of the spark plug threads and use threaded inserts?
I probably wouldn't have even noticed but they are loose and partially back out when I took out the plugs.
They are at different depths now but do they bottom out when the plug is tight?
I can't tell because the base of the plug covers the sleeve when the plugs are in place.
I really don't want to take the heads off. I had no issues prior.
If it ain't broke don't fix it?
Or am I risking a bigger problem?

[Erben914]

I couldn't find any cracks but two of the inserts are loose.
I dropped the heads off at the machine shop today. They are going to clean them up and give me a recommendation.
One of the intake valves was leaking when I did a test with gas.
I'm in for a valve job at least.
It looks like I have the flat top pistons, but I don't know if they are still good or not.
Should I pull the cylinders off to clean the outsides and inspect at this point or wait to get the heads back to do a compression test?
Will I be able to get the pistons back in without a ring compressor?
Sorry for all the questions. Any guidance is appreciated. (IMG:style_emoticons/default/biggrin.gif)