i swapped firebird v6 3.1 mfi to Carburetor:مضحك جداً:
I succeeded with this conversion with some issues
So I would like to know if there is another way to run the engine through the swapped, and if anyone has done the same?

 

While I absolutely admire your determination and welding skill in building that carb to MPFI lower manifold adapter, the engineering is, to put it kindly, , , off.........

In other words, I see an airflow nightmare there, and I'm not surprised it don't run right. If you really want a carb, locate the entire intake manifold/carb from an early 2.8 (Before 1986 if I recall correctly, maybe before 1985?) and use that as your starting point. Once you get it running right with a factory manifold/carb setup, then go looking for a bigger carb (more CFMs) if that's what your after.

Ya get an "A" for effort, a "C" at best for execution......

 

Meh.....I dig it. It should work.

Looks a lot like what we did to MAKE A JEEP 4.0 WORK, in a 1969 Unimog 404.

What I don't "get" is, the OP's actual question!