If the engine's induction system was the same, I think logic holds that it would likely make about the same power, but would do so at a lower RPM. I'm assuming a lot there, like if the engine can take advantage of the head's flow potential without the longer stroke. Without improvements to the flow and cam profile I don't see that extra 1/4" of stroke being that large of a benefit.
In a normally aspirated build, I kind of agree that even a 557 block 400 would be a better candidate. What I've always wondered about however is the 350's potential for a boost (specifically turbocharged) build. You overcome some of the engine's pitfalls like it's small bore when you start force feeding it.
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-Jason
1969 Pontiac Firebird
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