Upgrading to 15' wheel vintiques series 63

my 67 has small bolt pattern all the way around the rears are 15x7 with 4.25 bs 255 60, i have ran 15x8 275 60 with 4.25 bs

the fronts i have 15x5.5 with 3.5 bs 205 70

with your 4 inch back space as a only option 245 60 15 might be a safe bet on a 15x7