www.supraforums.com
It's all been covered many times before in the MKIV section there. PSI will be different depending on the turbo, flow changes, PSI changes. Only thing i'd really check is the title, and the body, lots of people fix up wrecks and sell em for a pretty penny. Look for wavy filler, mismatched body lines, and that kinda thing, other than that just the basics as with any car i'd assume.