Edelbrock Performer RPM

I am the original owner of a 71 340 Duster, 4-speed. The car is street driven with just over 50k miles.
Currently, I have a Edelbrock LD340 manifold with a Quick Fuel carb.
What do you think the benefits of replacing the LD340 with a Performer RPM.
I am quite sure I'd have to find a bit lower air cleaned for hood clearance.