What will happen if you put those tires on your car is that it will mushroom out because of the excessive amount the bead of the tire has to be pulled in to fit inside the rim. To get a proper contact patch you will have to lower the psi a bit which will cause it to handle poorly. If you want to put something on that'll stick, buy some sticky tires even like Z rated high performance tires would be better than the 275's because of lower treadwear rating (more rubber lost to the road = lower treadwear rating). Usually in tires they all start with around 10/32" so that's not much of an issue with treadwear ratings. Getting drag radials is a good idea for launching on the street because the tread has more patch to contact the road and is stickier as well. Good luck.
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previous name: 84stangLX
'84 Mustang 5.0 LX
my LX
'89 Mustang GT
my GT