Generally A bodies are not collectable unless they are original big block models.
An original numbers matching 340 A body may be more desirable to some but i think their value is more dependant on the quality of the car even if it's a clone.
Original 340 Abodies do have collectible value beyond condition alone. Clones or light modified clones in same condition of documented 340 do not bring similar money.
71 340 cars with desirable for year options are actually worth more than 67 hardtop 383 cars with desiresble for year option.