No hint on what is wrong with it?
Throttle shaft usually needs to be bushed. The tops warp and leak.
It appears to be a super six BBD. They flow less cfm than a 318 model Different idle circuits. The slant carb has a bent PCV fitting, thicker front choke "wall"
I love those carbs! there is a Holley that that Mopar used stock when Carter went out of business.
If you rebuild it make sure you get a 6 cylinder carb to intake gasket. There is a difference!!!
www.slantsix.orgThere is a video on youtube from Chrysler. It doesn't completely play.