your 92 Integra is not a GSR most likely. if you had one, i highly doubt you would ask if its a GSR. and assuming its not a GSR, the engine you have is a B18B nonvtec.

as for the which trim...depends on minor things here and there. first off, what wheels do you have? hubcaps? 14" 6 spoke alloys? if theyre aftermarket wheels, then forget that question.
do you have leather? if yes, then you have a GS.
is it auto? if yes, then 100% you dont have a GSR.
what color is the car? if its not white/red/teal, again 100% you dont have a GSR.
do you have a sunroof? if not, its an RS.
are your side moldings and bumper moldings body color? if not, then you dont have a GS for sure.
do you have air conditioning? if so, you dont have an RS for sure.

and so on and so on.

we cant tell you what model you have without any specs/options listed.