Welcome Shaun, very cool build for sure. Glad you joined the best site.
The Z06 chassis would require extensive work to retrofit into your car. I would definitely get in touch with the Roadster shop and see if that can fit the bill.
On the motor, N/A will save you alot of work and potential headaches over a TT build. My vote at this point is for the nelson BBC. Contact youthpastor on this forum he just build a Chevelle with a similar motor at his shop Chris Holstrom Concepts he's just south of us in Tuyalip, WA area.
Post some pics of the car and keep us posted.
Ryan