1968 GT/CS California Special Clone

I have a line on a very nice, clean 68 GT/CS. Auto. No A/C. Perfect interior. Body excellent. No Rust.
Has an almost new 351 in it. Red paint. Black interior.

They are asking $20k. The lady said she bought it for $25k a few months ago for her grandson but the boy doesn't want the car. She said she's willing to negotiate. We live in a small, rural town. She's not going to have much of a market for that car.

With the 351 it's more car than I need but for the right price...

So, what is the right price? Any prompt guidance is greatly appreciated.

Also, is Joyce H. "Mustang Mama" still involved in the Houston Club? She offered some great guidance many years ago when my son and I were buying a 65 Mustang for his first car.

Thanks!

Ken