You can put a B13 JDM Sentra red-top SR20DET into a 1991 240SX, it's a drop in.
As for my SE-R, let's just say I didn't know better then. Second gear had some grab to it, and it'd say it was good for high-13's. Lotta fun to drive, though.
Is it a teal 200SX? If so, tell the kid Max says hi, and see if he remembers me from the Team Nismo days.
Max