Yes, that ground out connection from the relay contact to the distributor is designed to kill the ignition momentarily, but the contact can hang up and, in my case, stick so I didn't get any ignition at all (until this was pointed out).
Another cause might be malfunction or adjustment of the Throttle Guard (dash pot) on the carburetor, if a 110 has one. Mine is a Super 8 Stromberg AAV-26 which should have one but doesn't (haven't been able to find one). But I don't have the problem you're describing.
The throttle guard prevents the car from dying due to lack of fuel when the OD drops to free-wheeling (I think). So perhaps the carburetor idle adjustment needs to be upped to compensate.
I someone has a Throttle Guard for sale, I'd be interested.
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