What CFM rating is the carb? Disable the choke. Generally these cars with their High Performance engines do not require one unless in very cold climates. The open plenum Victor Jr manifold will not send a real strong signal to the carburetor boosters without a BIG cam so it may be a little finaky. When cold pump the throttle once or twice with the choke disabled and crank it, it should fire up. It is probably getting temprarily flooded. I ran a Victor Jr for years with a Barry Grant modified Double Pumper (choke body removed) never had any issues. Don't get discouraged. As mentioned be sure your ignition is good.
