small bolt 15x7 cragar ss 4.125 back space

I want to put 14X6 with 3.375 backspace on the front and 14X7 with 4.125 backspace on the rear. My bolt pattern is the 5X4.5, on my sons 74 Dart Swinger. I was about to post these demensions and ask everyone if they thought they would fit before I go and purchase them .