Hi, guys. Thinking about changing out my wheels for my 1985 foxbody GT. This is what I want to buy:

15 x 7s for the front

-Offset 22.5
-backspace 4.89

15 x 9s for the back

-offset 18
-backspace 5.71

I tried to look through some of the other posts, but I don't know a lot about cars and couldn't make sense of much that was being discussed. I guess my questions are what size tires I should get and will the mechanic have to make any modifications to the suspension or use spaces, etc. Thank you in advance!