I had a T56 in an 86 Monte Carlo; I got rid of it, and I am in the process of putting it into a 70 Z28. You will need everything from the flywheel back
flywheel and clutch (have to do some research for yours, the 1-piece rear seal motors are a different bolt pattern on the crank)
complete slave/master cylinder assy (have to fab a plate for the firewall to put it at the correct angle)
In the Monte, I used pedals out of a 4th gen, I plan to try and adapt the pedals I have in the 70 now.
You'll need the trans, bellhousing, shifter, the yoke in my 200R4 was the same splines
You need the digital speedo, or TCI makes a box to drive the cable style speedo (that's what I am using), or Jags that Run does a conversion on your tailshaft to use a cable
New or modified crossmember (they make one for first gens, but I haven't seen one for 2nd)
modifications to trans tunnel (shifter is farther back
You can either run a pushbutton to energize the reverse solenoid, or remove the solenoid and plug the hole with a freeze plug (I plugged it)
Once I start building the stuff, I will be posting pics on my homepage, so feel free to check it out
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Texlurch - 68 Camaro (Just a little ol' LT1 with a Hot Cam, I SWEAR

" a little spray never hurt anyone, spank you very much!"
or the old standby:"I came here to race, not sell real estate. You ain't scared, is ya?"