You can get one from a salvage yard, but you'll probably want to have a reputable distributor shop go through it and make sure everything is working proprely and that the bushings are in good shape. I've never heard of CRT, so I can't offer any suggestions there. Pertronix makes a good distributor, and so does Mallory. You can also contact Tom Langdon. He makes a really neat HEI unit for the 194-250 engines.