15x8 & 15x6 (74 Dodge Dart)
My son's '74 Dart Sport has 15x6 on front with 205-60R15 and 15x8 on rear with 235-60R15. Had BF Goodrich Radial TA for 36,000 miles, now Cooper GT Cobras mounted on American Racing Torque Thrust IIs. Depending upon wheel backspacing, you have plenty of room for both front and back. The rears did rub a little, but we could have prevented that if we had trimmed the inside of the wheel lip when doing the body work.
Jerry