Question for the machinists

I've got a cylinder head that needs to have the head gasket surface milled slightly. .010" ought to clean it up. The head is aluminum (DOHC Neon if it matters).

I've also got a Bridgeport J-head mill.

I've read where the head gasket surface needs to be "such and so" Ra number. Is that achievable with a flycutter on a vertical mill or should I send this head off?
Thanks
John