Good post but a bit of a trick question, its pretty clear the 3.75 stroke has been set but there are so many other possible combos.

I would ask myself why on the 3.75 stroke?? In small blocks they love the 4.00 and 4.250 stroke so I figure that would bounce over to stroked BB six packs.

Na/Spray...if the 3.75 is the only "rule" I bet there are some really strong combos around.