The 7.5 should hold up fine on the street, with street tires, but if you go to the track and put on some drag radials or slicks and use high rpm launches you'll have problems. I ran my 7.5 with the 3.45's in it for a long time.
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1985 Mustang GT
'85 GT "Red302" 12.96@107.1 N/A ... Sprayin' for the 11's
2003 Torch Red Mach1 
'68 Fastback ...331 Stroker "Restomod"
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