Kelly Blue Book Says a 94' GS-R in Fair Condition with 140k on it is worth: $2,975.

Fair = that the vehicle probably has some mechanical or cosmetic defects, but is still in safe running condition. The paint, body and/or interior need work to be performed by a professional in order to be sold. The tires need to be replaced. There may be some repairable rust damage. The value of cars in this category may vary widely. A clean title history is assumed. Even after significant reconditioning this vehicle may not qualify for the Blue Book Suggested Retail value.

I lived in Austin for a few years and I know it gets got as hell in the summer...if the engine is in good shape (ie. runs smoothly, doesn't blow blue smoke) I would still be skeptical...what are you plans for the car...point A to Point B or are you gonna try to fix it up?

You could possibly pick up a used GS-R tranny for somewhere in the $500 range...not sure on that...