I had a bullsh1t 70hp cx motor in my 95 coupe and one thing I have to say. I NEVER DROVE IT UNDER 3K unless I needed to stop. I beat the hell out of that motor and only changed the oil like 2 times a year. Man I miss that baby. No power but a hell of a tropper. I have an ls now and I beat on it and everytime I do it seems to act a bit funny. I blow 2 motors and broke a tranny once I have parts falling off and creating a trail behind me. Ohh man that was a funny night. Car made it about 50 feet away from my house so I pushed it up the driveway.
Ohh yeah your GS-R will be fine at that RPM Just keep up to date with all the parts and stuff and you should be ok. If you blow it send me a PM and I will be happy to sell you a motor