The gasket set I bought came with two gaskets for the exhaust manifold to intake manifold.
I used the solid gasket meant for propane. The open gasket allows air flow up and around the stock intake, The offenhauser is just a flat surface on the bottom which you will see when it all comes apart.
If you are using headers I would think a cork gasket would probably be fine as you wont have the heat involved that you have with the hot exhaust gases
I used the 7448 Holley 2 barrel on a Clifford adapter plate and modified a 1" aluminum spacer plate to raise things up for linkage clearance
I kinda made my own linkage
this is an old picture taken before I changed to hydro boost brakes