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This is our second carb with the same problem too. Both "new", from the same place as the OP. I wanted to post the info as another avenue to investigate.

We had a lot of the same issues as I've read here with the 1958 M37. After taking it to an engine machine shop, I think we have it fixed! The main problem that we had was that the truck would not idle well at all. You could smell the fuel in the exhaust, and the carb was flooding. We adjusted...

One other thing to check is the clip that holds the float down. We had a clip in one of the carbs that wasn't going all the way down and it was allowing the float to move up and hit the bottom of the top plate. We had to adjust the clip to make it hold the float down in the proper place. We...

Call Vintage Power Wagons and tell them what problems you're having. Yens has been a wealth of knowledge for us while chasing some problems with the M37. (641) 472-4665. And they have lots of parts if you should need them. Don't give up yet! And +1 on letting us know before you put the...