But it was noted that the cylinder head being used "had" gone 640hp.... now are we to believe the op wants settle for less? ....or are we trying to meet/beat that goal? A lot of this reminds me of my first RB stroker. Hindsite being what it is I should have scraped some more coin together and just did it right the first time.

How many off the shelf pistons are there for a W2 head? If you're looking at a custom deal anyways you may still have the extra cubes at an affordable level.