Whick tire size should I use?

Johnny Dart said

I've had both,and I prefer the 215/70-14.
I have them on a 65 and 70 Dart.

Are you sure you have 5.5" rims ?

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good point stock rims are 4.5" and a 205/70-14 is pushing the limits,
185/75-14 or 195/75-14 is a better fit on those rims