Minimum mating Surface for Intake and Cylinder Heads Runners

My heads and intake are ported to use the felpro 1213
Contents Lower Intake.
Manifold Gasket Material Premium Quality Composite With Printoseal Sealing Beads.
Manifold Gasket Port Height 2.27 in.
Manifold Gasket Port Shape Rectangular
Manifold Gasket Port Width 1.16 in.