Tire size for 74 Valiant Brougham

Many OEM 14" rims have a 4.5" width. The P205/75R14 Hankook H724 has a rim width range of 5"-7".
Tire Rack - P205/75R14 Hankook H724

If you have a 4.5" wide rim, I would look for a 5.5" or wider rim to better run wider tires. Using too narrow rims adversely affects handling.