Dwayne Porter ran a performer series in a dyno test on his stocker 383 , it's in the tech archive , it was a turd , he swapped on the carter version of the same carb and it ran so much better , Ebrock has the carb made to their specs and it would appear that it is a different internal calibration than the carter version.
Two words- Strip Kit.
No kidding, I also have the carter book , the performer series is a mediocre carb best suited for use on 350 chevies ...
I'm pretty sure that Dwayne knows his way around a carb but I'll pass on that sage bit of advice in case he misses this thread
