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I don't think it will just be a bolt in thing. I think you would need some kind of adapter plate between the trans and the motor so they could bolt together. You would probably have to beef up the C6 to handle the 560 ft lb of torque the 6.0 produces.
you know, thats really a good idea..costly, but good. 6.0/Torqshift...get you a good chip/programmer and lay some propane to it...that in a 79 model would be the epitome of sleeper...the ricers would need new pants and seat covers after that one...