On the fords, when the 4.6's are broken in, you will get another .3-.4 tenths out of it. When my GT was brand new it went 14.3 at 99 with 200 miles on the clock. After 5800 miles and no modifications, it bolted a 13.77 at 102.
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'02 black mustang GT 5spd: full bolt ons, MPH 2.5 heads, VT stage 2 cams, p51 w/rails, cobra pumps/60lb inj high flow lines, windage tray, Granatelli COP, Brisk plugs, Pro mass 80, Kooks long tubes, mezeire electric wtr pump, 4.10 Diablo tune 331rwhp/319rwtq