HELP Please (pics attached)

68 Dart 270 4 door sedan SBP. Has 205/70R14 on it and they already bulge on the rims.... Want to put the bigist tire I can without any modifications. Willing to change the rims but would like to stay with 14s... Looking for any suggestions.... Can I put 225/70R14 or 235/70R14 or larger on without any rubbing, will they fit on a 14x6 or a 14x7 rim with no problems? Backspacing im not sure about. Would also like to keep black steel wheels, I have the original dog dish caps.



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