anyone know how many 1971 Twisters were produced?

Does any person on here actually , have an H code duster , with the A51 code on the tag .I would like to see one , the car and a pic of the tag also . I remember reading a magazine , cannot remember when, i read alot , it said that no Twister cars ever got the 340 performance engine , and that the package was just made to look like the 340 cars .I know i never seen one.