Old Tire Size Conversion?

Thanks for all the great info

I found this:

Standard tire size for 1970 Plymouth Duster 340:

Standard tire size: E70 - 14

Tire width (mm):
205

Tire sidewall factor:
70

Rim size (in):
14

Since my Duster was a 340 factory car, I assume the 440 weight likely caused the front end to sag alittle

I don't need or want any larger of a tire on the front end

I will look around for a 215/70-r14 or 205s if I can find a good deal