Except for the incorrect wheels, aftermarket tank, the cat door, the brush guard, the wrong air cleaner, the wrong brake booster, the wrong radiator (mentioned, though the pics look correct), missing AIR system, other emissions missing?, carb fan works?, tweaked fender lips and running board, missing bumperettes, patched CB antenna hole, hole in the cowl, weird mirror location (?), probably mirror mounting threads ripped out of the door?, fugly rear-seat harnesses, grab bar grafted onto the dash...
The floors look great and the lack of rust around the sill is almost unbelievable. It's not worth $13k though. If I was in the market, I'd say it's worth around $9k. If you fixed all the above issues that are fixable easily without painting and put new brakes and bushings, maybe $11k ebay price.
While you're mentioning best-ofs, a '78 is the only year to have 4:11s and fine-spline pinions. The rear vent windows started in '77.
I'd love to have some parts off of it.