Do I understand correctly; you have the heads too, and that is where the gasket needs to be to line up? Is the head opening that big too?
I am guessing you’ll be welding the intake or milling the deck surface of the head to lower the top of the port?
If you read my post above the previous owner milled the top of the port to lower it so I’m guessing his valve cover didn’t lay on the intake. The proper thing to do with these raised runners is to run valve cover spacers to raise the valve cover. The super Victor is worse yet. Yes I did port his heads and as always port match to this gasket witch is usually very close to as delivered size. Owner is going to tell me what direction he wants to go tomorrow.