Whilst it is cool seeing some of this old stuff, it really is a reminder of how far engines have come. Take one of the late 70's Pro Stock engines apart andput it on a bench on the left. Do the same with an Aussie Pro Stock engine, or something from Comp Eliminator on the right. The differences will be night and day.

As far head flow goes, those Glidden heads will probably surprise you, and probably not how you'll expect. I had some very trick for their day 810 casting W2's, didn't crack 300 cfm. Saw similar results with some rectange port W2's that were done by McCandless for a Super Stock engine.

We've learnt a lot in the almost 50 years since these cars raced.