Stroking theory question
There's a line at which you meet the point of diminishing returns with anything. It's not just about the physical fit. It's also about all that weight being pushed further and further out away from the crank center line.
Also too, to "me" an under square motor is not as efficient as an over square one. This is why Pontiacs sucked balls and why for the most part they had no street cred whatsoever in the muscle car wars. I know.....here come the Pontiac lovers. But it's true. The Ram Air IV cars even got beat up on by 383 Road Runners.