ok, for starters the pedal assembly remove the drivers seat, for ease of installation, along with the steering column. i believe there are 4 bolts on the firewall, and another one on the top. remove throttle cable and brake light switch. remove pedals. next put in the new assembly, and remember to use the right hole with the clutch cable, and also remember that the clutch assembly ratchets, so u can use this to ur advantage when installing the cable.
next you will need a flywheel, and one matched for ur engine, older are internally bananced, while late models are external. take the flywheel to a machine shop and have it cut, and if they know ask them to be sure its the right flywheel.
u will have to hot wire the neutral saftey switch, which can be dangerous, but i prefer it if u know ur car's in neutral.
you will need a double hump crossmember and tranny mount.
as for a t-45, luckily i had a few t-5's at hand, but i know a 4-cyl tranny will work if u have the right pilot bearing..... i believe a smaller one but not sure