Welcome to the Team Rick!
Not so much as what you buy but were you buy it. These cars were designed to last seven years or 100,000 miles before they wore out or rusted out. This was done quite intentionally because if GM had built cars to Mercedes Benz's standards we would all still be driving early fifties Chevys and Chevy would have long gone out of business decades ago because they couldn't sell another new car.
As such you want the rust part of the problem to go away. You do that by buying a car from the desert south west where there is no rain or snow to promote rust. Because towns and services are far apart in the desert south west the power train on these cars are just about worn out. But rebuilding the mechanical parts is easy (expensive, but easy to do) compared to body work. So if you get a rust free straight body then better than half of your problems are over.
Example a 1964 Chevy from an Arizona yard:
Over view of inventory in stock:
Surface rust that sands off easily due to morning dew; but no body rust or rot behind the outer panels:
The other half of the problem is the desert south west sun light destroys interiors tuning cloth to dust and plastic to deformed pieces of crud. So you will need a mid west farmer's car that was not driven very much to get the interior and numbers matching power train out of it; even though the farmers car has a rusted through frame and the sheet metal below the belt line is eaten away with rust.
So you don't want just one project car but two.