N00b help needed

I'm new to supras but I can tell the difference between a mk4 and a mk3. I ran across an 84 today, but it doesn't look like either one nor did it look like an 81 on ebay that I would only assume is a mk2 as an 80 is.

What I'm basically asking is can someone point me to a general information site about an 84 supra that would include specs, items of concern when looking to purchase, what price range I should look for so that I don't get bent over w/o lube when purchasing etc.

Thanks
Mike