Shouldn't have a problem. I think the AIR system only works on cold starts. So as long as you warm your car up before hand. I took mine through state inspection and it went through without any problems.
The only problem I remember when installing my headers were the rear bolts and spark plugs on the passenger side, it was a little tight trying to work by the blower case. And the directions that came with my headers said "modification to A/C bracket may be needed". I'm not sure about the gasket material but I remember hearing somewhere that the Aluminum gaskets are supposed to compress and form to the port a little better. Hopefully I'm thinking of the same material.
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