I hear what everyone is saying about the double hump heads and that the Vortecs flow so much better. That is one of the reasons why I was on board with using them hence why I purchased the ProMaxx units as I thought the earlier style intakes would bolt on. They are advertised as being drilled for both the vortec style intakes and the non-vortec intakes.
With that being said I am considering purchasing these aluminum heads 185cc intake runner, 72cc combustion chamber, 2.02"/1.60" valves. The heads are still ProMaxx Performance, just not vortec style.
http://www.jegs.com/i/ProMaxx-Perfor.../2171/10002/-1