Kendall GT1 dino version 20w-50 or Synthetic, or RedLine straight 30w.
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There is a good discussion on oils over on the prod board.

http://prodracing.com/prodcar/viewtopic.php?t=7391
http://prodracing.com/prodcar/viewtopic.php?t=7466

The current Kendall Oil is not the same as the old green oil. The Kendall brand was sold off and has not been the same since. Here is the maker of the old Kendall Green oil.

http://www.bradpennracing.com/