The number one benefit of the T-5 is the availability of two more shifts in the mix. No more lugging, then screaming, then more lugging and more screaming. Every time you shift gears with a T-5, you will be at the optimal power band of the 235 engine.
It is by far the best way to get all of the performance that you can get from a Stovebolt engine, and as a bonus, it's easier on the engine, not to mention comfortable, real highway speed in fifth gear.