FWIW, I don't believe Chevy started using the WC version until '88 in the Camaro, and I think about '92 in the S10. I rebuilt the one in my Dad's '91 S10 and in was a NWC.
The Tremec TKO-3550-2 is basically an aftermarket tranny for around $2500. Some lighter duty versions were used by Ford in the Cobra R, I think. Maybe a few other models. It would probably be overkill for your application. The NV3500 is a totally different animal.
