Air:Fuel Help. Cannot Get it Rich

nm9stheham said

Yeah, idle and other 'static' tests show up most problems but not some of the more esoteric ones. The line sizes seem adequate to me... I assume you are not running at 1000 HP? So that seems to go back to pump, regulator and restrictions as needing more checks, since all the attempts to enrich at the carb have been futile.....

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I'm guessing 525ish HP, so I too think I'm adequate on the lines and parts. The car was running great with a cheaper less flowing pump, and 6AN supply line dead-headed at the regulator.
Prior to running the Mallory return regulator, I even used a (new out of the box) Holley dead-head regulator and ran this new pump with 8AN from cell to regulator since I was in a hurry to make a track event. Same issue.