Well lesse?
306.1 x 6500(?) / 3456 = 576 cfm 2 100% volumetric efficency
The handy little sim dyno predicts 86% volumetric effiency which would mean 576 x .86 = 495 cfm as a target
I would say a dual plane intake (performer rpm or the like) with a 650 cfm carb. Should run with no restriction at wide open throttle
As an RL example I have a very mild solid roller brand x 355 with .599 lift on 278 degrees of advertised duration, It has ported 461 castings with a Performer RPM Airgap manifold a 650 cfm carb and 1-3/4 long tubes and at WOT it pulls less than 5 pounds of vaccum (around 3 or 2 pounds) at about 6,000 to 6,500 rpm with the 650 cfm carb.
Not to bash Ford (seeing as how I own a 91 5.0), but I'm willing to bet a dollar to a donut that even the grandpa 461 castings could whoop up on a set of E7TE's and with 49 less cubes I would say that a 650 would be plenty 'nuff carb to feed it. Even then I would consider a vaccum secondary carb with the 650 cfm unit
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