These engines go quiet well when put into a lighter body. My RS200 moves along quickly enough, although theres a lot of weight for 210hp to move off the line quickly. You'll probably find the MAF sensor & throttle body need cleaning & the previous owner is was running 10w40 in it. The run so much better with a decent 5w30 like Motul 8100 or Mobil1 & a decent set of Iridium plugs like Denso VK20 or NGK BKR6EIX11. Your average 40 weight oil in these engines puts to much drag on the VVTi system & 10w40 semi syn turns to sludge clogging up the solenoids. If you're going to be rallying it then you probably want to look at Motul 300V 5w40 as its a thin 40 weight but proper ester synthetic for race protection.
I'd have a chat to this guy, Celica RA45 >> http://z4.invisionfree.com/lexusaltezzaclub/index.php?showtopic=11266 >> http://www.tezzaworld.com/viewtopic.php?t=5040 He makes ITB manifolds for the 3SGE & has made some decent power