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the Rx8 gears are hardened, in fact everything S5+ is hardened.
you want the FD oil pressure regulator + turbo oil pump. baffle plate is good too.
i'd say you're good to go to at least 9k, the guy who does the balancing should be able to give you a better idea.
weber will work fine, it takes a while to get the jetting right, but when you get it right its very nice. if its a street car a holley 4 barrel isn't a bad choice either, its a little better @part throttle, just because its a 4 barrel.
on the port, you want to keep the closing port timing around stock, intake opening should be earlier than stock, but the earlier you open the more overlap you have and the pickier the engine is going to be.
its a really FUN car when you get it setup right
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