Be sure you have a new, clean fuel filter. Even the best pump can't push enough gas through a dirty filter to meet the demands of open throttle running. What were the results of the fuel pump volume and pressure test- - - -the one I'm sure you must have done by now?
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!