newbie advice

[arizona72]

I want to buy a truck for my son and I to work on. I found a 72 cheyenne long bed 400 big block with air. It has some rust but has been in Arizona for the last 20 years. It has extensive records from 1982 (2nd owner) and had the engine recently rebuilt. The woman selling it (husband died) is asking $4000. It runs well and everything seems to work. Has some minor dings. Does anybody thing this is a fair price...bad price? Thanks.