factory specs for 65 valiant?

im a new owner of a 65 plym valiant v200 2dr. with a 225ci. anyways it needs new tires, fairly soon. im looking to get the right size tire this thing should have. right now it has 2 diffrent size tires, three 195/70/13's and one 165/80/13. im just looking to get the right size tire for this thing, ive been told i can get 13's mounted and balanced for around $100 bucks. which would be awesome, thanks guys.