I've heard you can get better mileage with carbs other that the t-pot. I didn't really notice any difference with performance between the two carbs when driving. Right now I'm debating whether to go back to my original t-pot set up re-install the Autolite 4100. If I go back to the t-pot, I will need to have it rebuilt correctly and use the original dual diaphragm distributor which I have. The old t-pot caught fire once and nearly a second time which is why I switched to the B manifold and 4100 carb. Right now I'm trying to sort out the manifold to carb heat issues on the B manifold that I was using. The internal manifold heat pipes are rotted away and caused a small exhaust leak only noticed when driving but it is also sent exhaust into the carb choke thermostat. I can fix this correctly and fairly inexpensively without switching to an electric choke. The t-pot route would be more expensive but would keep the car original. Is there any improvement in fuel economy if I use the 4100? I know the 4100 wouldn't catch fire as easily as the t-pot.

~DJ~ AKA "Bleach"
1956 Ford Fairlane Town Sedan 30K original miles