Those will fit but you won't be able to lower the car without flaring it. My friend has them on his 280z, the rears stick out about 1-1.5in and the fronts (which are 7.5s or 7s) end up a little less then flush with the fender.
You'll have to flair the car before installing them.
(Unless it's a 280zx, these fill the rear PERFECTLY)
On tires, it depends what kind you run. Right now his car has 225/50R15 and they look a little stretched (Hankook street tires). He used to run BFG Drag Radials (same size) and they sat perfect on these wheels.
Most places have recommended wheel width size for their tires, I'll see if I can find it.
Mario