I purchased a crate engine 383 Chevy with Brodix IK series heads and a no name air gap manifold. It has a bad vaccum and oil leak around intake manifold. The manifold is tight and it appears the manifold is bottomed out and leaking around top edges. It looks like the angle of the manifold does not match the angle of the head. Is there a way to correct this with a gasket or what? Thanks in advance for any help.