Help! Intake manifold won't fit!

I just pulled my 67 273 Commando manifold off to replace it with a Performer. Steel intake gaskets came off with the intake. Now when I put the new manifold on with Edelbrock gaskets the damn thing sits to high. I'd have to clearance the bolt holes to get them in. I pulled off the gaskets and put the manifold on without them and it lines up. What do I do!? I know you are not supposed to use steel gaskets with aluminum heads. Does someone make a thin fiber gasket?