Help with pricing a truck

[Gmcfolife]

I'm considering buying a truck and need help with what it's worth.
It's a 1972 c10 swb highlander special. All original with rust only on the passengers drivers door that isn't bad and also the bottom of the tailgate. All original drivetrain with a 350 and automatic. It has ac,ps,pb,tilt wheel. Everything works. Condition is good for original paint. Thanks for your help.