Tremec

I would look at the T56 Magnum as this: A 4-speed with twin OD's. So, honestly the big advantage to it in my case was 2-fold, I run 3.23 rear axle gears so the 2.97:1 first makes it hit a little harder at the beginning and easier to drive, and it has a .8 and .64 OD. The .8 OD is great for 40-55 mph and the .64 is good for 65+ MPH. Here in MI I drive a lot of 45-50mph roads and the freeways are 70 speed limit, 70 mph is 1900 rpm for me which is ideal. My engine is totally fine with 1500 rpm running so it helps a lot there.

If you bought one of the member's mounting brackets for the hydraulic clutch, a .81 tilton or wilwood MC and a 2002 Camaro LS throw out bearing, spacers, and an AN line plus the adapters, you can do it cheaper. I ended up swapping the throw out to the 2002 Camaro one later because the APEX universal one had so many spacers on it and didn't like being concentric and would make noise on the centerforce clutch weights.

I doubt you'd get a bench in with a T56 magnum though, the shifter is a little further back and its wider behind the torsion bar crossmember. Its even tight with my bucket seat on the passenger side (I moved it outboard slightly)