I too have these wheels in the staggered 17x8, 17x9. 17x8 was fitted with 245/45/17 for the front. 17x9 was fitted with 275/40/17 for the rear. Lowered the car 2". I could not be happier with look or fitment, all on a 67 Firebird.
I did buy the Gorilla ET lugs right here:
http://www.amazon.com/gp/product/B00280A2ZI/
to get some additional threads engaged. I did not need to use longer studs.