Builders: Square engine, Over Square, or Under Square for you?

There's no real performance advantage of running a square or under square engine. Obviously you can make power with them people do all the time. But smaller bore less breathing ability and less surface area for combustion force to be applied and less displacement for any given stroke, longer stroke higher piston speeds will Lessing the rpm potential but with materials we got now days is lesser of a problem, generally higher friction loss and does offer more multiplication of combustion forces but for same CID (smaller bore) there less force to be multiplied basically a wash overall, displacement matters more to torque than how you achieve that displacement.

Obviously most are gonna pick the biggest bore out of these 3.

Bore x stroke = cid , 4.07 x 3.31 = 345, 3.91 x 3.58 = 344 and 3.685 x 4 = 342 all basically the same cid the 345 has the advantages but don't mean you can't build a crazy 342 it's just the bore mainly is working against you now if you looking just for a mild build you could easily make 300 hp out of any of them.