I have 15x7 with 4.25 back space now , will 15x8 with 4.625 BS fit in back

with 265-50/15 ? Dart 1970 all stock , 8 3/4 with HD springs . Any body run this size , not that all A bodies have the same dimensions out back .
Or should I stick with the 15x7 with 235 0r 245- 60 series tires ?
Will 15x7 4.25 BS fit in front with 225-60 15 , or will I have to go smaller , 215-60-15 ?

Thanks