Rear tire width max for 67 Barracuda

I know you probably want to keep your tires under the fender lip but I thought I would post my tires for anyone else who might want to know the max width (without having the tires stick out) on a car that's jacked-up like mine. I'm running 295-50R15s . I moved the springs in 3/4". Now I'm looking for some 15X12 rims cuz I'm sure I can use 12" wide tires and looks like they would come out flush with the outside fender lip.
I'm sure you noticed I'm going for that mid 60's street car look, just like the ones I used to drive back in the day!!!! I even managed to find some old slotted wheels from the 60s, polished them for days!!!LOL

treblig