71 340 manifolds

Seems high to me for those manifolds. 7/19/71 would most likely be a 72 model year car. Or an extremely late 71 model year car.

The correct heat shield stove pipe assembly would be for a 72 motor. It has a value on it's own. Not sure on the value, but you have to factor that in.

The drivers side stove pipe assembly would point to this set being out of a 72 model year car.

Are you looking for correct casting numbers (looking) manifolds or does it matter to you if the date code correspond to your SPD date (scheduled production date) on you fender tag.

use the search function on FABO and see what past sets are asking for and if they sold.