That is a Quincy made pump, you can check eBay for what the Quincy 216 pump sell for. If you use a 3hp motor, that could be a really nice small shop/ home garage air compressor. If rebuildable, it could outlast you. This is one of the best mfg and this series is one of the best in the world. It’s old (1960/1970 guess)and not all of the hard parts are available. These are way nicer than the newer models in the 3hp range. This series uses pressurized oil vs splash lube, could be in amazing and rebuildable condition. I would say on FB marketplace 100-200 for the compressor, or if a parts machine 25-100, depending on area. Rebuild kits are around 150, but you need to see how the parts look. If you clean it up, you could sell the running unit and have money to buy a new motor and cash. A running machine will bring far more money, vs a gamble on a pump. If it has sat or continues to sit outside, the cylinders could rust, falls into the parts category.