Old school cars are great. I had a twin cam fast back celica, rx3 and 200B with a Z18 back in the day. All good fun little cars, but are a pain to drive daily, allways need work and don't have many modern features... not to mention a 32 would be a much safer car, better brakes, better suspension etc.
Old cars are still OLD cars, even if they are cool.
Be patient, a nice 32 gts25 manual will come up.
An rb30 block will be undetectable to most people. You can also re-number the block if your worried about it (easy to do). Or you can just leave it 25, ballance the bottomend, run 10.5:1 compression, set of re-ground cams and a re-tune. It should be nice and snappy with a good exhaust and intake.
Run a little nitrous on the track if you like too.... 75 shot on a hi-comp 25 would be fun!