I'm sure that the shop takes everything into account , they have been building winning mopars for 30+ years . I'll let you know how it does on the dyno , and if the weather cooperates he track .
If that's the case then hopefully I'll learn something from this and I'm wrong but... those heads will need to be shaved .060" or more to bring the deck surface to the same plane as the quench areas IF it is needed. I'd guess it won't although you would benefit from a more efficient engine overall with the quench (less spark advance, lower octane req., leaner running, less tuning sensitivity etc.) just something to think about and maybe inquire your engine builder.
