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Doc, simply crank in on the adjusting nut to raise the relief pressure on the pump, this is just going to be a quick test to see if raising the fuel pressure is going to solve your stumble issue.
I have a sense that it is not going to help as your video clearly shows that you are maintaining a visible fuel bowl level even when the fuel pressure drops to 4.5 psi. 4 psi should suffice to keep you bowls full for your 450hp motor. Heck, us Weber guys are running 3psi fuel pressure with smaller float needles than you Holley guys.
I am surprised that no one has commented on your statement that the car nearly dies when taking hard corners, I am thinking these two issues may be related
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