Have the T-56 serviced if it has high mileage since it is 14 years old, unless it came from a really low mileage car. The 3/4 fork is a little week and older units may need service. I pulled a friends apart, replaced the input bearings and the 3/4 fork assembly a few years back - he was shifting from 1-4 (skip shift on the trans) when the trans got stuck in 2 gears simultaneously in the middle of an intersection. There are stronger shift forks available aftermarket now, and I believe that TTC has upgraded the design on new transmissions in about 2000.
Since it doesn't sound like you are using the Camaro engine or ECM, I wouldn't worry about the skipshift feature because the computer isnt there to activate it.
I would buy new gauges myself vs a speed-box converter
Other than that, welcome to the 'bolt, post pics
Scott