For what its worth I tested a pair of Pro-Systems Holleys on mine this year. It went a best of 9.02 with a string of 9.0x@148+. I reinstalled my old box stock Edelbrocks went a best of 9.11 with a string of 9.1X@148. both sets were jetted very close. Air was with-in a few hundred feet on 4 different days of tests. The track was poor during the Edelbrock tests. 60 ft was off .05 average. Some of that could have been the carbs as well but I feel on a good track it could go 9.0x. The amazing thing is that both sets mph very close.
Doug