I scored an awesome MCM find: oak parquet tiles for under $1 a foot, salvaged from a house before demo.

Most are in great shape, minimal glue on the back (non asbestos, not bitumen)...I am ready to glue them down to my wood subfloor with Bostick MS Grip.

Has anyone done something similar? (glue down reclaimed glued flooring)?

There are concerns that the tiles may not adhere properly or be level due to the old dried glue remnants.

i am crossing fingers that the glue will handle these issues, and refinishing will fix any others. Any experience or pro installer feedback is appreciated!

Are these 5/16 thick? T&G?If square edge you will be able to smooth the floor with a d rum sander after they are stuck down. If T&G then, you would best use a drum sander with 16 grit coarse paper to skim the old glue so they lay without bumps.
I would recommend using the coarse paper to scuff off any oxidized glue anyway since you have some old remnant there that you would be sticking the tiles to the floor which could be loose.
It is a lot of work to lay a floor that will last.