You may want to take both heads to your head guy, along with your cc data. Have him evaluate which one is best for you to use.
He may be able to clean up the first one with milling a bit off of the head to get it flat. This will just make the chambers slightly smaller, depending on how much he needs to take off to get it "true" again. The other head may need a slight clean up, but not as much.
He also may want to look at the condition of the valve guides to see which one is best to use.
If you are thinking of using a cam above .500" lift, then let your head guy know so he can make sure that there is enough travel in the valves to accomodate this and not get into coil bind/valve bottom out. Make sure that you have some "wiggle room", ie. if you are going to run .500" lift, make sure it has a minimum of .550" or .600" travel in the valves, depending on how much lift your cam will have.