272's, multi-angle valve job, non-billet 67mm
The head on that truck is similar to the one on the '94 (BC 272's, 5-angle, non-billet 67mm). That car made 543 @ 19# on Sunoco 94. Granted, it doesn't say what gas he's on, but someone would specify if it was on race gas.
Nonetheless, killer truck despite its impracticality.