4 link question

It can be done using the stock frame rails (Baughmans killer SS Hemi Dart had this set up done) but you'll have to pretty much fab it yourself or buy the brackets and bars and modify it to fit your frame rail.

The upper and lower bars won't end up being equal length but that doesn't really matter.

Personally though, I'd go ahead and just back half it, you can do it like a SS car and leave most of the stock trunk floor in it but you'll still need a fuel cell in the trunk and a rear firewall.

Why do you think you don't need the big tire?