IF YOU OPEN YOUR DRIVER DOOR AND LOOK AT THE VEHICLE INFORMATION WHERE IT TELL YOU THE VIN NUMBER TIRE INFLATION REGS ETC., IT WILL SAY THE YEAR MAKE MODEK AND TRIM OF YOUR INTEGRA I.E. LS, GS, GS-R, TYPE R
ya for sure, any B18 engine can fit in an integra. I don't know why you would want to swap in a slower engine tho...
The GSR engine is a B18c which comes with VTEC pulling out about 178 hp @...
A standard GS engine which is a B18B1 has an output of about 142hp the GS-R has an output of 170hp (B18C1) A type R engine which is a B18C5 has an output of 195hp.