How thick is gasket? I would think you would get better seal by leaving a bigger gap, like up to half inch. Then use about 3/4 to an inch closed cell foam and let it compress. Vs. Try to get it close/precise and use thinner gasket.
That's what it is about an inch high. Sits on the ring lip and compresses against the hood pan.
I liked the setup on the 70 Buick GS much better. It useda dual snorkel air cleaner with those foam rings. Much nicer.