Looks like it has lower adjustable links in the rear (good support for it to be a Special) and maybe I see brake boosters there too. Having a five speed is at least a $1000 positive, so worth noting- there should be a small, round aluminum tag on one of the rear housing bolts indicating the transmission type number (hopefully not missing).
Lots of custom work though which takes value down, and an unknown engine condition. Huge risk since you can’t drive it to see what condition everything else is in, but looking at it’s condition, I’d say you’d be in for all mechanical systems at least (engine, brakes, bushings, bearings, trunnions, boosters...). Peek behind/under the dash to see how much “custom” wiring has been done...
Your $5k value is probably solid, many of the parts on the car are worth that alone though.
Hagerty values are always on the higher side- #1 condition is considered not achievable (like a perfect score)- most gleaming show cars are really #2, etc.- this is probably a #5..