First off, you Did not buy a 1960 GMC C60, a c60 is a chevy model, you truck would be a 3500, 4000 or 5000 model. do you know which it is? if not whats the vin number on the tag in the door frame? I can tell you a lot by that number. also whats the number on the engine, it could be a 305 B or C, both use a different carb and manifold. Check these page to see were to find the engine number:
GMC V6 Engine Data Page .
