7000 rpm is the limiting factor IMO. Would likely flavor more stroke. But generally a bigger bore will make more power than more stroke, but when you are talking BB Mopar the bores are not very large for sure. The old saying bore makes power stroke moves where it happens.
the only factory engine with a bigger bore is a 460 Ford. The 454 is 4.25
that is why there are so many aftermarket blocks for them. The 396/454 engines with rectangle heads have huge bore notches from the factory, the 396's are only 4.096. The un-notched oval port engines are only a 2.06 intake valve...........advantage Mopar. Bigger bore , larger valve. And when they did settle on a 4.25 bore they knew the only way to get a big valve un-shrouded was hemispherical.
