Well I finely found the direction I want to go in. This shop does alot of custom frames for for older corvettes and they can build them with or without the trans axle/torque tube configuration.
http://www.streetshopinc.com/c5andc6for53-82.html
The most appealing part to the whole thing is I have all the C5 suspension parts sitting on a 02 corvette I was piecing back together (any one need some corvette body parts? LOL).
I actually had a 06 Viper diff I was going to use in a cobra IRS then put that into the GTO. But that wasn't feeling right for some reason.
The kicker is that the shop isn't interested in selling me the front and rear clips. I laid out some of my plans for the car and they wanted to build me a whole frame less the suspension parts for around 7K. So I mulled that over for a few and then started asking the shop some questions and the guy just seemed pissed (for lack of a better word) that I was asking questions. He threw some track width measurements at me and when I asked how he came to those suggestions he said. I've done a few other uni-body cars in the past. Communication from that point was really lacking. Why are some shops like that?