'65 Valiant. Will 15x7 wheels, 205/60/15 tires fit?

Your existing 185/80R13s are about 24.6 diameter. 195/70R15 are about 25.8. 205/70R15 are 26.3. If you want a similar diameter consider 195/60r15 at 24.2 dia, 205.60r15 at 24.7 dia and 215/60R15 at 25.2 dia. I sent you a link to a handy wheel and tire size comparator via PM.