Bulter holds the record for the fastest pontiac ever, ( in the 6's ) it's a twin turbo, and guess what heads he runs...Edelbock....my guess Wide Port e-head. Which they now have flowing 400 cfm. I would talk to either Dan Barton or Gaby and get their opinion. I think their all good heads but hell if you can make the power you want and save yourself from having to by another set of heads, it might be worth looking into having your e-head done, if you still have them.
The things they hide, the way they spin things, the excuses that they make and the things they omit.