This is a Revell '53 Vette Roadster. I saw some pics of from SEMA of a 53 Corvette body on a C5 Z06 chassie, interior and motor. I tried to recreate it, but i feel I fell short. This is a couple sites with cars from SEMA.
http://www.vetteweb.com/features/0301VET_Red/
http://www.corvettecenterltd.com/The_Garage/Display_1/body_display_1.html
Sorry the first pics is blurry.
http://files.automotiveforums.com/gallery/watermark.php?file=/503/826461111-med.JPG
http://files.automotiveforums.com/gallery/watermark.php?file=/503/826462111.JPG
http://files.automotiveforums.com/gallery/watermark.php?file=/503/826463111-med.jpg
http://files.automotiveforums.com/gallery/watermark.php?file=/503/826464111-med.JPG
Overall I think its a good idea for a conversion but i did a bad job. I think one of the more skill fabricators could do a much better job.

You sure this isn't what you saw?

A special 1953 retro styled body on the C5 chassis.

There is a resin transkit available of this car.

http://www.scalevisions.com/vette/c553/c553_front.jpg

yep that was the insparation