I ran a ‘73 340 cast iron spread bore intake on my 65 Barracuda with the same as Commando air cleaner and had no problems. And that was with a 1/4” insulator gasket.
that being said, and I have no reason to doubt the poster, I'd go really slow on closing that hood the first time. I've seen a lot of hoods with "reverse dimples" from a carelessly slammed hood.
