If the carb is basically "aftermarket", then the above bracket kit is needed.
When I did such an upgrade on my '67 Newport 383 4bbl, I ALSO needed the kickdown rod extension item. I also had to use the thick insulator carb base gasket so keep the carb from being so close to the plenum floor, for better power. It all fits fine. I used the stock 4bbl air cleaner with no hood clearance issues.
For the kickdown rod, Edelbrock 8004 (7/16" rod) or Edelbrock 8003 (3/8" rod) is needed if the throttle is moved too far forward. You can probably ease the throttle cable forward and reuse it.
Intake gasket? Get the 440 6bbl paper gaskets (should be 4 in the package, IIRC) to go with the existing valley pan gasket. The paper items were used in the '69 440 6-pack intakes (which were aluminum) to keep the steel gasket beads from imprinting on the softer aluminum intake. I added black high heat sealer into the beads of the valley pan gasket to ensure a better seal than just the steel gasket can provide, plus the paper protecting the gasket surface on the aluminum intake. I ALSO got some harder black carb studs from the auto supply.
Just my experiences,
CBODY67