Interesting to know what was learned from this thread? I feel the competent consensus was not to expect any significant change because no significant change was planned to be made. There are a few examples of high HP 'pump-gas' builds to model. Some people are saying this can't be done. Some guys I am familiar with DON'T or haven't dyno-tested their engines and they do just fine. But the one's that run well, methodically chase after their combo for improvements. I've seen more than my share of good performers on the dyno that didn't translate into the car UNTIL supporting parts and tuning refinements were made!!! Just the same I've seen quite a few inflated dyno #'s. Not that it matters but, I'm curious what people think my 'old' 485" would 'dyno'.