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The 6.2 (and, for that matter, the 6.5) were designed to go wherever a smallblock/bigblock would go. So the short answer, as FMJ so eloquently put it, is "yes."
It's been many years since fooling with 454's. I remember that they do bolt up without a doubt, but didn't the 454 use a different (balanced) flywheel/flexplate? I seem to remember they were big block specific. For example you would have to have the 6.2 (or smallblock) flywheel??? Been many years/beers ago. Maybe i'm wrong just thinking outloud.