WOW! 4.25" Stroke Small Block Cranks now availavbe from BPE!

I wonder if you could use the rods and pistons for a 4" stroke with 4.125 stroke crank in a tall deck R3 block. Anyone know?
Those BPE pistons have a skinny oil ring and the rings are close together. Also seems like they would rock more. I think the bob weight on my scat h beams with those KB pistons for my stroker was 1769. That was before I had .040 milled off the step of the pistons, so may have been slightly less.