"How can I check to see if it's been rechanbered for 38special? I have found an new old stock barrel in 38 special and an k cylinder in 38 special. Will the k cylinder work?"

The easiest way is to get a .38 Special cartridge and see if it can be chambered completely. The frame could be fitted with a K-cylinder and a new barrel. But you might not have to skill to get those fitted properly if you have no previous successful experience in doing such work.