Autolite 4100
First off what the heck is an Autolite 4100 carb??? And second using a 4 barrell adapted on a 2 barrell manifold is futile especially when the inlet of the manifold is the size of 2 quarters and each barrel of the 4 barrel is that size. Kinda like trying to stuff a tennis ball into a garden hose. It may run but it sure ain't going to flow the air it's intended to flow and would be dificult to jet properly.