The GT500 hood rubs on the top of the bumper (the part between the headlights and grill) when used w/ the V6 or GT bumpers.
It also looks pretty much like crap, because the rise on the front edge of the GT500 hood doesn't line up with the grill on the other bumpers.
If you want it to look right, you really need to get the GT500 bumper too
You CAN go the other way (regular hood + GT500 bumper) without problems (I know what I'm talking about having done a conversion):
http://torchvert.smugmug.com/photos/...23_hehJz-M.jpg
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2005 Torch Red 4.0L V6 Mustang Convertible
X-Charger HiPo Supercharger w/ Wet-X water/meth injection
SPEC Billet Aluminum flywheel, Centerforce Dual Friction Clutch
JBA Headers, H-pipe, Corsa mufflers
3.73 gears and Detroit Truetrac