Intake Manifold Question

That would be my gasket choice. That exhaust crossover passage is there to heat the intake manifold for cold starts and cold weather. If you are using a stock type choke then you would probably want to use it. If not a cooler intake air/fuel charge makes more power, just look at an Eddy Performer RPM Air Gap manifold. It lacks that passage and blocks the crossover ports in the heat. I have been blocking that passage for decades.