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To clean the deck surface of the block where the old headgaskets were use a scotchbrite rollock disk similar to what you use to clean the turbo. You DON"T want to scratch the metal surface--no wire brush, sand paper, anything that might remove metal.
I don't know the size of the head bolts but 14 or 16mm comes to mind. Check the headbolts in your gasket set OR your studs. Make sure the bottoms of the bolt holes are dry/oil free--air hose works great.
dont know about napa. I work at a dealer and motorcraft has it. "metal serface prep".
remember the idea is to remove old gasket material. gasket staining is normal and can not really be removed without removing metal.