I picked up a viper t56 for project. Rated to 650trq, the new t56 magnums are rated to 700. But for what I paid, I could buy 3 new magnums. They are actually good for a lot more power as long as your not running slicks and dumping the clutch.

68 Road Runner, 69 Belvedere, 71 Challenger Vert
340 barracuda, 01 Ram CTD, 95 Ram, 04 Ram, 85 Daytona turbo Z
66 GTO, 06 Magnum RT AWD. 07 Ram CTD, 07 Ram