If I may make a suggestion: Please consider contacting Mr. Patrick James, owner of Pro-systems.
Tel.: 231-798-6397
www.pro-system.com
Patrick built my carburetor for my FE Ford. Like yours a 427 with 428 crank. When we took the engine to the dyno the carburetor settings were spot on. We could not improve on the carburetor settings. Fuel curve over the entire RPM range was as close to perfect as possible, idle quality excellent, throttle response so good that others in the shop walked over and looked in the dyno room to see if the engine was injected.
I could go on but suffice to say that Patrick truly know his business. Plus he is a pleasure to work with.