Weber Carburetor for Slant 6
I just posted some gibberish regarding your same post on slantsix dot org. Now with photos I can see that you indeed have a hydronicly heated Clifford manifold; this is a good thing for drivability.
You need to ID the carburetor you have. This page may help with that task:
http://www.webercarbsdirect.com/Weber_Carburetors_s/2.htm
Weber carbs direct for optional choke, and parts:
http://www.webercarbsdirect.com/WeberCarbsDirect_Troubleshooting_Guide_s/274.htm
Weber troubleshooter’s guide: [ame]http://www.webercarbsdirect.com/v/vspfiles/images/Weber%20Trouble%20Shooting%20Guide.pdf[/ame]