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Go to your local book store or www.cartechbooks.com and get 'Building 4.6/5.4L FORD HORSEPOWER ON THE DYNO' . They have done dyno test on that swap and any other you could think of. It covers truck and cars.
the truck plenums flow better than the mustang ones.. the opening on the truck plenum and the outlet is larger. port out stock plenum and ur good to go