'47 is one of those years with two different body styles. Does this truck look like a '46 or like a '48?
I assume its a Chevrolet mostly because you say the motor is a 216.
Parked for 50 years I would be surprised if the motor just turned and wanted to run without any work. But if Alamo City is a dry place and the truck has remained dry and maybe inside, its possible its not stuck.
I've seen trucks I would not pay $1000 for, but if its complete and not beat to pieces, and includes a title that matches the truck, that is probably a fair price.