Not sure why that carb would be listed for Pontiacs. It looks like a generic square bore E-carb to me. Shows to fit Pontiac engines as well as 305 sbc engines, during years when they came with a Q-jet carb. A square bore carb won't bolt up to a Q-jet intake, without an adapter.
I think some guys use 'em on the old 389 engines, to replace original AFB carbs. Lots of guys have bought 'em, because of the Edelbrock name. Most guys on the Pontiac forums do not recommend 'em for use on Pontiacs. Instead, most recommend either a Q-jet or a square bore Holley type carb.