1962 Vette radiator has the correct mounting points for Cobra and return tube on top. 1963 forward used a different top loop. More of a hook design.
Griffin makes a nice ally side tank design:
http://cgi.ebay.com/ebaymotors/1961-...Q5fAccessories
$469 = Griffin
$189 will get a similar Champion design:
http://cgi.ebay.com/ebaymotors/CHAMP...Q5fAccessories
The original tankless are upwards of $800 though....
I am using a Fluidyne as I fear the other design may not totally remove the heat. Not period however the Fluidyne works A-1...