383 rebuild - kinda whimpy on the dyno?

YY1 said

what tuning changes were done between the pulls where HP peaks at 295 at 4800 RPM and those where it peaks at 330 HP at 5300 RPM?

That's a fair amount of variance.

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It was not a typical session. Ron made that clear. It seemed to lose hp when we would run the exact same test back to back without making any changes. I think the only thing that was done during the time you are asking about was changing timing... from 35 to 34 to 36 degrees, then back to 34 again.