Need Advice on Buying first RX-7, what to look for

[AK-7]

Looking at buying a 84 GSL. 90k, no rust, small dent in passenger side. Had been stored at one time and the current owner (older lady, has had it for about 10 yrs). She says it started overheating last year, has a new radiator but problem apparently still exists. She says it starts up and runs well other then running hot.

Questions are, what could the overheating problem be/cost for me to fix it and how much should I pay for a clean gen 1 with these miles and possible issue?

This is going to be my son’s car for us to work on together and auto Ross together. I love older Japanese stuff, just want to know the do’s and don’ts.

Thanks