Those times are just a little off. I ran a 15.2 @3000ft bone stock in my 88 convertible GT.
What year 5.0 do you have?
Are you at high altitude?
What was your 60ft?
BTW: Dont buy equal length 1 5/8's headers and put them on stock heads. I did and they made me 2 tenths slower 
Later,
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92' LX-Big brakes, Lots and lots of suspension, GT40X heads, Ported cobra intake, stock cam, Vortech SC trim.
00' Lightning-Stock
88'CRX-13 second ego killer
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