I would swap out the intake and carb first. The performer intake has the small runners for a 318. A performer rpm or large runner intake will match up to your ports alot better. And x2 on the edelbrock to holley swap for the carb. And check to make sure your gas pedal is using the full travel of your throttle. I had that issue, Gas pedal was only opening the carb 3/4 of the full travel. Good luck in finding better numbers.