The original tires were P78 bias ply tires. They were 6.95 inches wide so there height would be (6.95*0.78*2)+14=24.8" tall. This would correspond closest to a 205/70/14 (24.9" tall) or a 225/60/14 (25.3" tall).
If the tires you have don't rub then just keep em and change the speedo gear in the transmission so the speedometer reading is correct.
-JON
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