My Shelby Charger was under $10K but was an earlier model. So $12k in 86 is right particularly in light of the 500 prod. nos.
Half of todays new SUVs will walk away from these but they do bring back memories.
It's still quicker than today's SUVs unless you are including crossovers and is as quick as today's base model mustang (0-60). Not bad for a 30 year old car. Its biggest problem though it style and mystique. It just doesn't look performance. Now the escort shoguns had something to them, but even that's a stretch.