equal or unequal..wich is better and why?

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I've heard the equals are only good for MAYBE 1 or 2 hp over unequals. I am using unequal.
While were on the topic of headers, I'm changing gaskets tommorow, Felpro 1415's. 1. Do I need any sealer or anything? and 2. Should I just use a gasket scraper to clean the header and heads off or do I need to clean them with something else too? Thank you!