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

Cuda416 said

Hadn't considered heat dissipation. I was thinking more simply about the burn having more surface area to push down on per stroke and wondering if there is a decent way to estimate how much additional power was possible just on that factor alone.

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I sure there's away but it's really not needed, basically like in this case, say a 400 over bored to a 409 and our normal 360 into a 408. For the same given amount of fuel and air ones gonna get a higher percentage of it's torque from the larger piston but the other will have more multiplying effect from the longer stroke.

Torque is more about displacement and it's VE% it don't overly care how you make it (bore/stroke), I'm not saying there's not advantages one way or another, just for most of us if you build a 408 or a 409 you should be able to get similar torque per cid.