Accurate LTD has released a very hard to find Mopar product, a reproduction of the 340 Engine HP Manifolds. These are not exact reproductions, but are very close. They do not have the casting numbers in them or the heat riser. Not sure how well these will sell, isn't the point of having the original manifolds to have them exactly as original? Maybe for someone who wanted to save their original manifolds it might be practical, but I think I would either want the original thing or go with headers. Accurate LTD makes GREAT reproduction exhaust systems, but I kind of question the need for this part.