While a T-56 is certainly strong enough for most street applications, it comes with a weight penalty, it's about 50 lbs. more than a T-5!
If you want the best of both worlds go to: http://www.g-forcetransmissions.com
for the ultimate T-5!
600HP+ in a 3,300 lb car with drag radials producing low 10 second 1/4 miles.
Mark