BLOWS BLACK SOOT

ECM only controls the idle fuel mixture and the ignition timing....nothing else. I would suggest getting the codes, and see what the ECM has for info on the problem. It is definitely a carb problem. Perhaps it was running fine when it left Fla., but bouncing on a transport could have caused a problem.

I pulled the #8 & # 6 plugs today and they had the same soot as I'm blowing out the exhaust  so I'm really hating to think that the carb was not replaced but fixed to stop it from stalling so more questions do I try and find another shop or send it to a rebuilt facility which all they do is rebuild Q-jets all day or buy a new one or replace it with a bigger and better compatible one don't want to reinvent the wheel I want a plug and play any ideas

Get a Q-jet repair kit and rebuild it yourself. If they truly didn't give you a new carb, then I would get a new float also. You don't need a bigger carb. IIRC, the Q-jet is good to at least 700 CFM.

You said you were going to get rid of the O2 sensor? Can't do that if you keep the 81 carb. The computer needs it.

Take a GOOD look at the choke. Also, if you can get your hands on the MARCH 2017 issue of VETTE magazine, there is a good article on rebuilding a Q-jet. The cross shafts may need drilling and rebushed. A VERY noted problem after years of wear. It could be sucking air past the shafts and creating a different mixture.

I cant find out how to lean out the carb only info on the net was only about the choke any ideas

OKAY IT WAS THE Q JET THE HOLE TIME IT WAS NEVER REPLACED I THINK THE SHOP JUST SPRAYED SOME CARB CLEANER AND BILLED ME ANYWAY AFTER READING ANYTHING I COULD GET MY HANDS ON THESE 4EME ARE PRETTY SIMPLE TO TUNE BUT THE EASY THING WAS TO JUST UNPLUG M/S AND THE TPS AND SHE RAN GREAT FOR THE FIRST TIME SO THERE WAS THE PROBLEM THE DWELL WAS OUT AND THE VOLTAGE TO TPS WAS WAY HIGH ALSO SET TIMING TO 12 BDC AND 36 ADVANCED VACUUM IS STEADY AT 18 FINALLY NO MORE SOOT NO MORE BLIDING SMOKE

Glad you finally got the issue resolved. Have fun!