"...so many guys have rebuilt them to factory specs over the years and dyno tested them..."
I'm guessing that VERY few 2-barrel stock rebuilt engines have seen any dyno time. And, most who just build to factory specs aren't really interested in the dyno numbers. Dyno time is not cheap.
But, there are probably lots of dyno tests of rebuilds of some of the most popular high performance engines, such as RAIV, 455HO, & SD455.
Another reason why accurate numbers are not available is because most rebuilds will include, larger than stock bore size, less than stock deck height, different pistons, & a different cam. So, the cubic inch, compression ratio, quench distance, and cam specs are not close enuff to factory specs to be a good comparison.
