Re: 1939 Coupe Convertible
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Sorry your first post on Feb 11th didn't get posted but as moderator I went through the logs and I can see you joined on the 11th and set a display name but don't see any post so not sure what happened.
To clarify Fred's note a bit. The DY-A1 is the proper carb but the DY-9C will work and looks the same/similar.
As Jeff suggested you may have a gas problem. Either old gas or the alcohol based gas may have caused some clogging. I run alcohol free gas in my Crosleys but ran one tank of alcohol based gas for about 10 miles before syphoning it out and the Crosley was already running rough, the gas had dislodged something and it was clogging the carb. Since it was still running I gave the gas a heavy douse of Seafoam carb cleaner and within 30 minutes the Crosley was running good again, that was 5+ years ago and I still have not tore down the carb. The alcohol based gas tends to clean the fuel system and also dissolve some rubber parts in the system, so a fuel system that hasn't been rebuilt and fully cleaned can be a problem.
As far as brakes, I have never worked on a PreWar. If it is a 39 they had a strange floating brake shoe but I think the basics for mechanical brakes are the same just make sure all the cables are free and activating the brakes and adjust to brake all 4 wheels equally. The other thing to check is oil/grease on the brake shoes. Hopefully some PreWar owners will jump in with suggestions on the brakes.
Your Dad has a nice looking PreWar with great history. I hope you can bring it to our Nationals in July, we will be celebrating the 80th Anniversary of the introduction and yours would be a great example.