Truss rods cannot correct significant neck bow, and trying to do so can snap the truss rod or otherwise damage the neck. If you're seeing neck bow, take it to the best luthier you can find for analysis and estimate. And if you're looking for a "vintage guitar" for rational money, look at Japanese guitars from the mid-1970s to the mid-1980s - Yamaha, Alvarez, Takamine, and other recognizable names especially. Look for guitars that look like they've been played a lot - not getting played is very bad for acoustic guitars, and closet classics generally don't have good tone. Check the tuners and
