I have a forward rotation 82 T-bird water pump on my stang and I had the same problem. I just modified my pulley a little bit 
Sounds like you got the wrong pump to me.
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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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