I have a stalling problem when I brake hard to stop. Not panic braking, just making a quick stop. Engine starts to stall out. Obviously it is a fuel problem. I’m running a sbf 427 with a Quickfuel 750, Holly external fuel pump. Runs perfect under heavy acceleration so I don’t suspect the pump. Possibly float level or pressure regulator set to low? Pressure set at 6lbs. Any ideas?