with a big block and a heavy car, I'd suggest something beefier then the T5....Even the "World Class" version breaks easy. A TKO might be a better choice for your application. Once you run with the overdrive 5 speed, you'll really learn to like the dual role a 5 speed will do...lots of good low gears to get things moving and a long winded 5th gear to help with the RPM and fuel mileage!!!!!!

Besides, with a 5 speed, you'll no longer be "shiftless"!!!!!!!!!