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.