Here's a site with some great practical information concerning the Stromberg NA-S3 carburetor. Of particular note might be the discussion concerning the carburetor part numbers allowed for use on the Continental A-65 motor. There are only two:
http://thestrombergspecialist.com/index.php/86-news?start=5
I have been corresponding with the author, Bob, about a particular problem with my NA-S3. He's very helpful!
http://thestrombergspecialist.com/index.php/86-news?start=5
I have been corresponding with the author, Bob, about a particular problem with my NA-S3. He's very helpful!