Needing new tires

No reason to.
All 14" small bolt Chrysler Rallye wheels are 14"×5.5".
Your 225/70-14 tires are fine on them.

If they're original rallye's. If they're not, they could very well be something else. And not a single tire manufacturer's specs that I could find that currently make a 225/70/14 would tell you that it's ok to run 225/70/14's on a 14x5.5". BFG doesn't, Cooper doesn't, Hankook doesn't, Coker doesn't, General doesn't. Minimum rim width for that tire is 14x6" from all of those manufacturers. Just because you can make it fit doesn't make it right. Maybe you won't see obvious signs of abnormal wear, maybe you won't notice the differences in handling, but the folks that make those tires say they shouldn't be on those rims. And it's in their interest to tell you they fit because it will improve their sales, so, if they tell you they won't fit there's a reason.