T-56 Transmission Install Thread

I never paid a lot of attention to this thread because I figured my Tremec TKO 600 was enough gear and torque capacity for my stroked 6.1 (now 392) Hemi 'Cuda. I do like the 6 speed in my Challenger Scat Pack and now have bought a 707hp/650tq Hellcrate motor for the Cuda, necessitating a beefier trans to go with it. I believe Tremec has a 6 speed called Magnum that will hold up to the HC Hemi. Can anyone provide any input on this? Is this pretty much the transmission you guys are talking about? I enlarged my tunnel for the TKO and sure hope it's enough to move on to the 6 speed. All input appreciated.