Here is a great caddy board.
http://www.cowboyseven.us/forum/index.php
You'll see me there, i go by longhorn man...who woulda guessed?
Some of the early 500's were 400 horse and 550 torque, all at very streetable low RPMs.
Even the later smoggers were monsters, the lowest rated one (these are net, so it's apples to oranges in comparison) 210 horse and 360 torque. Which, those numberes seem low, but trust me, they'll plant you in the seat while your U-joints cuss at you.