Why not a 3spd stick with a Warner overdrive? Perfectly suitable for what you're trying to do; you could also use a T5, although Im not sure WHICH T5 the inliner crew prefers. I'm sure someone here can provide the info. The T5 swap is probably more involved than the 3spd. If you're keeping the motor stock, and want to keep the 'feel' of the car, I believe the 3spd stick would be unique and work well for your application. I'd also put a 3.55 to 3.73 set of gears in the car.
Edit: Its seems strange to say something that was commonly used in the 50s and 60s as being 'unique'