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NA means naturally aspirated, which means there's no turbo or supercharger, the blacktop 20v is a newer version of the 4age (the engine you've got) that has black cam covers, variable valve timing, and a couple other things that are different.
Yes your engine pretty well the same engine as in the ae86, it just has a few little differences.
What do you mean when you ask where to bracket the AFM? just leave it alone is what i did, it's not totally worth it, but it does free up a little bit of power and looks better imo, and is the cheapest mod you can do to the engine.
And i REALLY REALLY hate to say it, but SEARCH, these are some REALLY basic questions that you could probably find in no time flat on google and wikipedia, together those are a great tool for finding stuff out about this car.
As for mods, it's the same as any engine
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