Most rebuilders think that if a carb will bolt on, and most of the hardware hooks up, it's good to go. Yes, the engine will run, sort of, but it will take a shop full of sophisticated test equipment to get it even close to right. I've seen different Rochester carburetor part numbers, and different jetting, power valve springs, metering rods, etc., with nothing more than a rear end ratio change, or a difference in compression ratio on the same size engine. The worst carburetor in the world is one that doesn't fit the application.
Jerry
