The glyptal style paint in OE castings is simply to prevent
oil leakage through any casting pores. Cheap and simple way to avoid issues. Beyond the skirt coating the rest of the various "treatments" will serve to increase speed through extensive wallet lightening capabilities. At the 400 HP level you should simply concentrate on good ring seal, good machining, quality name brand parts, and good assembly practices.
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Survival Motorsports
"I can do that....."
Engine Masters Challenge Entries
91 octane - single 4bbl - mufflers
2008 - 429 cid FE HR - 675HP
2007 - 429 cid FE MR - 659HP
2006 - 434 cid FE MR - 678HP
2005 - 505 cid FE MR - 752HP