I was wondering the same thing Pat. You better check that oil hate hearing those big booms! that come with a gas filled crank case. When you had the other carb on your motor was your exhaust hooked up?
I've had motors that had lots of compression that could not breath because the the exhaust manifolds would not flow enough. The car ran fine with them off but when I put them on the car ran like crap, so I had to go with headers and some good high flow mufflers.
Kurt