easily fit on front as you wanna run a bit of camber up front anyway. rear will be more of a challenge without touching guards or running more camber than front. or small tyre like 245.
have a look here for a few example
http://rimtuck.com/search/thumbnails&make=Nissan&model=R31-R34+Skyline+2dr&yearfrom=1995&yearto=1998
and its the lower the number the further out it it will sit
also i wouldnt spend $35k on a stock 33 gtr. maybe if it was a low km lm edition or it had like 10k kms but even then its only worth the money if you never drive it.
considering the main purchase point of that car appears to be the low km's, i would be asking for the japanese de-registration papers to help prove the km's