Ideal Billet head in my mind would be a BAE-8 style head, if you could fit the design onto a IA-2 style block (since it uses a 4.181" bore chamber). BAE Heads have years of actual race time at the top of the sport as related to the other guys components on the head. EVERYTHING in the Head Design was designed for boost.
That being said, that is not going to happen so then the "Fall-Back Plan" would be, can you get the Warp 6 head to perform as well as say a BAE-5, BAE-6, type head?
A Complete set of "KNOWN DESIGN" BAE-5 "like New Heads" are selling for $5,250.00
http://www.racingjunk.com/Drag-Racin...der-Heads.html
Doubt if you could get the basic Warp-6 castings for that money much less finish them with similar components.
BAE 5 Cylinder Heads complete with Victory Titanium Valves, 1359 PAC Dual Valve Springs and Manton Titanium Retainers. Heads have a manufactured date of 5/27/2010. All parts have only 3 full Runs since installed new in Oct. of 2010. These heads are in "Like New" condition.
So figure out how to mount a BAE-5 Head on the Pontiac Block and go racing.
Tom Vaught