Does anyone know what if anything pontiac did to these heads? I know they are 400-428 ram-air H.O. heads but what else did they do that makes them different from the other 72cc heads.

Nothing...

Being 1968 and newer, they have open combustion chambers in contrast to the closed chambers in the earlier performance heads like 670's.

They have 2.11 intake valves and 1.77 exhausts, and screw in rocker arm studs.

The ports are the same as most other d-port heads.

It's all about flow. And from your question I bet this flow chart just might interest you:
LINK: http://www.pontiacpower.org/ultimateflow.htm

Thanks for the link!

Great link, Jim.