I usually stuff the bores with rags or paper towels and use scotch brite pads to scuff the surface. Then make sure you vaccum any debris, it work's for me. I don't think you will need to retorque the head gaskets, I think thats for copper gaskets but I could be wrong, hope this helps.
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91 GT Convertable, 306, TFS TW heads, B41 cam, Holley Systemax, S-Trim, Bassani LT's, and Flo's
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