Check out Apolo Ohno's 64 Caddy convertible.
http://www.kindigit.com/64_caddy.php
As I recall, it had a frame swap with an Art Morrison frame.
And one of the ways they made it handle was to build a set of wheels that look like white wall tires, but the white wall is part of the rim and the black part is a low profile tire.
http://www.ridetech.com/garage/2011/...lac/?nggpage=3
Check out the photos of the wheel and tire in these photos.
That will help your caddy turn!!
Here's a couple of links to part of the video of the build at Kindig-it Designs on Hot Rod TV
http://youtu.be/ASJykxr4qWc
https://www.youtube.com/watch?v=mVk03gsi0gs