My 2 cents...
Body, body, body, then frame, frame, frame. FJ40's are very simple mechanically and with a 73' your going to want to upgrade most of it anyways, changing the front drums to discs, upgrading whats likely an F motor (no such thing as a 4L in a FJ40 but it could be a 4.0 liter?? though the F was 3.9 and the 2F is 4.2). And the mechanical stuff is relatively inexpensive compared to fixing rust on a body and worst a frame. In fact if the frame has any appreciable rust, its not even worth repairing in my opinion, considering a clean frame can be had in the $200-500 range. But that body would require a complete rear "re-skin" imo which can easily hit the $1k mark if your doing the work or $3k or more if your paying a shop to do the work. If your not looking to make it perfect, you could do some metal patching yourself and just make a great trail rig out of it? Otherwise you could search for a clean tub and then depending what you want to do with it, a bunch of small parts too ie. Turn signals, backup light, etc are all. The motor could be a newer 2F (you could read the motor ID # and find out easily) or it could be the original F with a aluminum valve cover installed. Is it a 3 speed or 4 speed?
It does have a rare drop down rear tailgate which in addition to the loops on the tub corners makes me think this Cruiser was likely an OEM softop.
I would say this is more in the $750-1700 range depending on things like trans, t-case and motor coniditon and ID as well as what kind of shape the dash, doors and w/s frame are in.
Good luck!
