The graphs on your link seem to indicate that this all works well above 5,000 RPM for bike engines. I'm wondering if this would apply to the lower (4500-5800) RPM range on our "old 6s".
Some use Nitrous on big blocks that are definetly not high rpm engines.
As for not spanking a lot of 350s, if all things were equal, that may be true, but most 350s are under 350 hp with an auto tranny, and driven by someone who has never even been on a race track. I have even embarrassed a few with my 2.0 Jetta
