Rear with stock orignal springs or lower ride height

• with small bolt pattern or redrilled sbp axles/brakes:
  
  • 15x7 with 4 1/4 backspace and 245/60/15
• with large bolt aftermarket axles
  
  • 15x7 with 4 1/2 backspace and 245/60/15

Front with large bolt pattern factory parts brake conversion:

• 15x7 with 4 1/4 backspace with 215/60/15 tires. 225/60/15 will be close but can very due
  to alignment specs. Area to watch interference is lower front fender lip. Adjusting lower
  stabilizer bars outward will help or cutting/rolling lip.
• 15x7 with 4 1/4 backspace. If you cut, roll lower fender edge 1". Or install 1" to 1 1/2"
  longer lower stabilizer bar. You can fit 245/60/15 up front

Here are pics my 68 Dart conv with factroy never replaced quarter panels. With small bolt pattern axles and rims with 15x7 rims and 245/60/15 tires.