71 340 manifolds

found a set of manifolds for sale
fit "A" and "E"

working heat riser, with stove pipe baffle and flex hose

3418621 7-19-71
3418623 5-24-71

wants $450

he says they are worth it...> 1 year only...
compared to the multi year 68-70 manifolds

Are they going for that much?

I did a search
only found a passenger side for sale, it was $275