Not Ranked
Ed,
Your Roush heads flow a lot better than my Ford Motorsport GT-40 heads. Your HP gains might not be as large as what I would get. I anticipate a gain of 50-60 HP going to the AFR 205's. Then if I was to redo the headers and sidepipe, get another 30-40.
Heads $2000/60 = $33.33/hp
Exhaust $2000/40 = $50.00/hp
Of course, spending $4k is nearly halfway to a Keith Craft 408 with 525 horse and a stronger bottom end.
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MadMiles442 
She said, "The only thing I'll ask of you, you gotta promise not to stop when I say when..."
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