Edelbrock 1406 and intake manifold combination

[kenneth]

I just bought a Edelbrock 1406 carburetor for my 72 Charger with 318cui - I know in business for new intake manifold and were interested in Edelbrock 7576 - Edelbrock Performer RPM Air-Gap Intake Manifold.
On Edelbrocks homepage I found this text:

EDELBROCK PERFORMER SERIES 600 CFM, ELECTRIC CHOKE CARBURETORS
CALIBRATED FOR FUEL ECONOMY
Designed for small-block and small displacement big-block engines, these carbs are recommended only for stock to Performer level applications. They are not recommended for use on RPM or Torker II intake manifolds. Match with an Edelbrock Performer or Performer EPS manifold and other brands of similar design. Calibrated 2% leaner than #1405. Includes both timed and full vacuum ports for ignition advance. Comes with: Metering Jets - Primary .098, Secondary .095; Metering Rods - .075 x .047; Step-Up Spring - yellow (4" Hg). Use our Carb Stud Kits #8008 or #8024 if needed, see Installation Items. For auto trans throttle lever adapters and more, see Tuning Accessories.

Can anyone tell me why I not can use that intake manifold

[purplecharger]

The air gap do tend to run cold.
I have a hard time driving mine when it gets down to 40 degrees.

[MrSnicks]

The RPM Air-Gap is a performance manifold. The carburetor is calibrated for Fuel Economy. You want a performance carb to go with the performance manifold.

Patrick