It looks smooth from the pics but it also looks like you have some pitting. As long as it perfectly flat with no ridges that you can feel with your fingers you should be god.
You dont use a spray sealer on a new hg. Ra is roughness average - in short its how smooth the finish is. both block and head need to be machined and look like a mirror finish.
If your still on stock turbo its not worth it and even with a 57trim it still might would not be worth it unless you had a walbro which at that point you might as well get the 550's so you dont run out of fuel.
Can it be done yes, but its not reccomended.
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