Intake Porting/Machining

How much will (if it will) it help to take my M-1 intake in with the Eddy heads to have gasket matched/machined to the heads? Is it worth the extra dollars? I could see when I took the intake off on the crate Magnum 360 where carbon had built up which I assume is where they machine the ports? The engine is going back together as a 408 combo. Thanks for any advice.