I emailed Mark Connor at CHI and he told me this:
They take about 10 days to go thru the process from casting to finished heads.
We can airfreight them direct, last pair was to NC and shipping cost was $548 AUD. Cylinder head price to supply direct from here is $1708.00 each AUD.
There would also be US tax and possibly duty payable on arrival before US customs release them.
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That's about $2900 US shipped which isn't bad.
But I'm not even that patient. I bought this thing a month ago and want to DRIVE the thing!