You’re going to have a tough time with a salvage yard radiator being good. I don’t know if they would pressure test it for you or not. I’ve never bought a salvage yard radiator. If you want to go that route find a Truck Salvage and ask about a 2 ton or larger mid 60’s radiator. Since these buses were shipped from GM as a front clip and chassis w/o a body, they would have had the radiator installed at the factory. Hope this helps.ðŸ›