Thanks all. I took the floats and needles off three times. Blew it out with carb cleaner. Regulator set at 5.5# verified with fuel pressure gauge.
I flipped the top upside down to close the seats and tried blowing through - and it was definitely sealed when it's off the car.
Put a new filter on it today also, just in case.
Guess I could have gotten some really dirty fuel.