that chart is also specifically BaT results for that average valuation, the average foxbody is a beat to shit trailer trash abomination so it won't make it onto the website.
You can still pick them up all day for sub 5k for a shit one, at most 10k if you want a good runner.
FDs, if you can even find one (there was 1 for sale in a 500 mile radius), will run you an absolute minimum of 25-30k in any condition even if you import it yourself.
Like I said, you can't even buy a roller for what you could get a running good condition foxbody for.