Edelbrock Air Gap on Magnum 318 Problems

Double check how much clearance you have at WOT with the carb off, between the linkage and the front pump squirter, set it will fealer gauges.
You may also need to open the rear butterflys and close the fronts for more response.
Do you have a Holley book? It explains this in detail.
I just noticed you are in Sutton, you are close to me, I am in Clarksburg.