from what I remember, there is a lot more room to play with in back. If your car is stock or close to it, 17x8 will fit all around, but if you dont have the exact proper backspace up front, you may have to trim the front corner of the fender a tiny bit.
If you dont mind possibly having to trim a little up front, you can probably fit up to 17x9 up front, but out back I have seen up to 17x10 without modification.
But....keep in mind what works on one car may not work on another when you are cutting it close. Our cars are now 40 years old, and unless youve owned it the whole time, who knows what prior owners may have done to throw you off.
Im a building contractor, and my first rule is always...measure twice, cut once. Same applies to buying new wheels!