Carter vs carter fuel pumps

Any suggestions? My Edelbrock carb is supposed to run no more than 6 1/2 lbs pressure.

From the Mancini link above...

PRODUCT DESCRIPTION
Fits: Small Block

The product specialists at Mancini Racing worked directly with the Federal-Mogul/Carter Fuel Systems brand team in bringing back these highly sought after mechanical fuel pumps that Mopar enthusiasts have been requesting for some time.

Both the Carter M6902 (small-block) and M6903 (big-block/Hemi) have the following features and benefits:

• 5.5 to 6.5 PSI