Hi Shiv, welcome to the forum..
Have a read of this link, it outlines what to look for when buying a skyline.
I cannot stress how important it is to have the car checked over by a pro, its only a few hundred dollars compared to a 6-10k rebuild!
http://www.skylinesaustralia.com/forums/bu...e-f-t35129.html
Cheers and good luck with your search.
Johno