Uremco’s Holley 1920. Just don’t do it.

AJ/FormS said

There is a simple fix for that called a pressure test. When you go to buy a rebuilt, you take your pressure tester along and test the carb before you buy it; just invert the thing and pressurize to 5psi.It should hold that for a minimum of 20 seconds.
If it doesn't, move to the next one.

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Can’t test one from Rock Auto. You pays your money and takes your chances.

I agree it’s probably a stuck float or needle/seat problem. However, this is advertised as a bolt on and go carb, not a buy and spend a day making adjustments Uremco claims to have done.

I may keep the new one and send it to Woodruff.

The old one is a bit rich running even with mixture screw all the way in but it is drivable. My Dart is a daily, so I will run the old carb for now.

I didn’t tighten the needle seat but when I put the fuel line in. I know what can happen to the needle tip.