How much would you spend on it?

Prices for most things depend on your location....like real estate.
Here in Texas, what sells on FB Marketplace are models in demand and the price is not right but cheap!!! Thats the real economy except for the high incom people. That is in general, you will always find the guy that finds exactly what he wants and cares less what it costs. The average guy wants value iIF he has the extra income.

Many people on CL etc are not cars guys and only way they price anything is to see what "the other guy is asking!" Want a "minimum " rust C body ? look at Tx Ok Mo Ms Ar and then talk to the guy without hurting his feelings and offer 1/2 what he is asking... good rule of thumb. Sometime offer 1/3 IF in Tx.!
But remember not all cars have lived their entire life in Tx and some lived on the coast!