Hahahaha nice logic... Dude I'm telling u its a piece of cake, you can add any carburetor to any car...
We installed a hiace carburetor to a chevy caprice.. We considered every aspect while doing that, we are getting 12kmpl local on it. Its a huge monster on road.. When we can achieve such economy with big carbs then what's the point sacrificing power and running the engine too lean.
And fx has its own carb available or u can use mehran carb on it. It's gives good economy but the blunder this brother has done is not something really out of earth or good considering the engineering principles...
Just make the manifold of carburetor and weld it on top of your carburetor manifold and enjoy whatever carburetor you love to use. Install a holley inc carburetor and enjoy quad jet carburetor.. So stop praising something that is against engineering principles.