I have a 65 coronet with a 440 that puts out an estimated 525hp. I have a holley black electric fuel pump with a holley regulator. -8 is ran to the regulator and -6 to the carb. I set my fuel pressure at 6.5 and it slowly drops down to about 3. I initially thought it was from heat so re-routed the lines to the carb, but it still does the samething. Any ideas on what it could be or what to check for. thanks