Yep Prop Comps - There was some conjecture as to whether they were the standard casting or a modified version.

I seem to remember Bryce talking about a couple of changes he asked Edelbrock to make to their casting but they wouldn't, so he went to Pro Comp.

It would be interesting to see if he or someone else has the AIRWOLF CNC programme, esp if it was run on the std Pro Comp Casting.