Overdrive or don't worry about it? !

IIRC, you had a thread about going all out on the rebuild, I say an overdrive unit would be a plus.

If you intend to keep the car, how are you gonna like those RPM's in 10 years, 20?

Best of both worlds, IMO, keep the performance where you want it, and then sit back and relax on a long trip. Win/win!