Why go with the NV4500? If you are going to do a manual swap, go ahead and get a T-56 from an F-body. But try and see if you can pick up a unit from a 98-02 model. Depending on your mods, you may want to upgrade some of the internals--like a LS7 clutch and flywheel ARP stud kit. You will need a new tranny crossmember, clutch pedal, and master cylinder. From what I know, the shifter location is pretty far back on a T-56--and you can buy a shifter relocation bracket that moves it like 5-6 inches forward so you can have the shifter up where your cupholders are. As far as the computer, get a custom tune. Everything is done inside the PCM through tuning software.