From the very end of the scoop(the two little pointy tips) I would guess about 1 1/2 inch from the end of the hood, but that's just a guess. I would go to
www.mustanggt.org and email them to find out, I'm sure they'd know. You could look at a pic of a stock one too and figure it out from that. Hope this helps somewhat!
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85 GT many mods drag car
84 SVO auto x type car