Well there's nothing wrong with the fbodies torque or HP which will be more than a 281 CID Mach. The MACH is designed for the strip and can put down it's torque to the ground much better than an fbody. The weak rear-end in the fbody requires some work since it can't take the torque it has when you really on it.
The Mach is one sweet car, this is a drivers race which the fobody has a slight edge over most people. I've always loved being the underdog, the fbody has the hype and presure to win the race with it's bigger motor and peak HP/Torque.