I've got 17x7et42's on my early super. There is enough room there to go 7.5's if the car isn't too low.
On the late supers, the track is wider, by about 10mm per side IIRC. I don't think that'll be a problem unless you go for the super-slam look. Keep the tire small (205/40 or 215/40) and you should be alright. It's not a problem mechanically to put on a larger and wider wheel, tons of people have done it without issues. You'll need narrrow coils to prevent tire/coil interference.
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