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Originally Posted by quickjack
The Engine Masters builds are always running more compression than a useable engine would with pump gas, and the longer stroke gives a more favorable dwell time at TDC to help prevent detonation.
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A longer stroke will decrease dwell time, which will hurt power, and if you are able to run higher octane/ i.e. more compression than a short stroke, high dwell, then maybe it would be a wash.
A while ago, HotRod did a comparison of two BBC's, same displacement, but different bore/stroke comnbinations, and using the same heads, intake, headers, cam, etc., even I think keeping the stroke/rod ratio similar, and they didn't find a measurable difference in torque/hp. However, a bigger bore will allow bigger valves, but that wasn't the point of their test. Keep everything else the same.