Bone yard
I think you would have to get a roof from a Mustang bone yard and then weld it in. Not an easy job. I would just look for another good unibody and transfer everything to it.
Rev
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'66 Coupe, 306, 350-375 HP, C-4, 13.07 e.t., 104.8 mph, 1/4 mi.
O.B.C. #2
'66 coupe
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