I just got a fuel pressure guage and checked the pressure. It shows 9 psi, the Edelbrock manual states that this carb (1405) requires 6.0 psi. Would the 3 psi make that big of a difference in the performance of the carb ?, causing the flat spot that I am experiencing ? The carb is only 6 mos old with 325 miles. If I need to purchase a pressure regulator, do you have any suggestions.