http://www.summitracing.com/parts/EDL-60929/

$735 ea for complete head assemblies

If you build it with 906's & try to obtain quench you'll need quench pad pistons designed to work only with open chamber heads...The short block won't accept closed chamber heads later without a piston swap... Plus to obtain quench with your 906 heads is gonna require machining each chamber to equalize the depth plus machining each piston the set the quench pad height... It would be cheaper to build a zero deck short block & buy closed chamber heads whether you get Edelbrocks or Stealths...