Timing? Did you hear any funny sounding noise? You might try to check timing...if only statically. If you have a fiber camshaft gear it is possible it sheared off a tooth or two. Also possible your distributor was loose and shifted position. Carburetor? Rochester? Have you worked on it? There is a chance the float has failed or stuck...needle could have also stuck open. Look down the throat with the choke open. Do you see raw gas in there? Is there fuel on the manifold gasket or at the point of the throttle butterfly shaft?
