Someone asked me if there was info about this so I figure this would help some people out.
Putting a T56 6spd into a Gbody is pretty simple and straighforward, not much to it, just like installing any other Transmission pretty much.
It's good to start with getting all the parts:
T56 6spd Transmission (LT1/LS1 Fbody or GTO Type)
Clutch, Flywheel, Pressure Plate, Pilot Bushing/Bearing
Clutch Pedal & Hydraulics
Shifter & Crossmember (several companies make one now for Gbodies)
Depending on what you have in the car you may need a driveshaft or work done to the current one you have if you do not want to buy a new one. It uses the standard GM 27 Spline Slipyoke
I bought and built up a low mileage (like 20k miles on it) Tremec T56 6spd Transmission. Along with it, I bought the GM LS7 Clutch Kit with ARP Flywheel Bolts., I have a 6.0l LS Engine in my car, you guys with the Gen 1 & 2 SBC just get the appropriate parts & LT1 Fbody style T56 Transmission.
Since most of these cars were factory automatic there is no factory Clutch Pedal that will work with this. You can buy one from the few people that build them, or you can build your own.
I installed the Master Cylinder on the fire wall like it would have come in a LS Fbody. Once I did this I built a Clutch Pedal using parts from an early 90's S10 Pedal. This seemed to work perfectly for the geometry and full movement of the Master Cylinder. The geometry and movement are critical in this case, it has to have full movement as straight as possible so the rod will not bind and bend.
$7 at the junkyard and a few hours of time I had a Clutch Pedal built..
I used a longer grade 8 bolt and mounted it next to the factory Brake Pedal. I cut the Brake Pedal down so it would clear the Clutch Pedal and use the proper size Pedal Pad..
I bought the T56 and got to the shop with it, then tore it down for inspection. Everything looked pretty much new but I always upgrade them..
Parts showed up a couple days after to build it with the LS7 Clutch Kit. If going LS buy a Speed Bleeder, they are worth it.
I re-built the T56 with the upgrades and it was ready for install..
Pilot Bushing installed and LS7 Flywheel was bolted to the back of the 6.0l..
LS7 Clutch Disc and Pressure Plate installed..
Slave Cylinder with Speed Bleeder mounted on the Transmission ready for install into the car..
T56 and Crossmember installed into the car and driveshaft installed..
The Shifter was then installed and the Center Console put back together. I made a custom Shifter Plate for my SS..
Then bleed the Clutch out and take it for a drive. Nothing much to it really and it's pretty fun to row gears with..