I have a 1990 - 560SEC, I put a 600 CFM Holley carburetor on it and removed the 2 high PSI fuel pumps and installed 1 low pressure fuel pump, I have the kept the stock (Dry) intake manifold and made a adapter/Plenum and put the Holley on it.

97 SL320, Your Comment was.

When you do a carb install, directing heat to the area below the carb is a must. Accomplish this by running a tube from one exhaust manifold to the area below the carb to the other ex manifold or run heater water flow through this area.

( Me ) The car runs super strong and has amazing power now, But like you said, It won't take the throttle until completely warmed up, Should I run a 1/2" exhaust pipe (through) the carb adapter/Plenum or just weld it onto the outside so it will transfer heat ? I am afraid if it goes (through) the carb adapter/Plenum it could cause a fire ? when first shut off ? What do you suggest I do, Thank you so much for your help.