The intakes with 1 barrel carbs are common. The two barrel carb intakes are a little more rare, but not hen's teeth rare. The valve covers are approaching hen's teeth, in my opinion. I don't live in an area where a lot of folks are still running inline sixes, so a lot of my perception comes from what passes by on eBay. I haven't seen an Edmunds valve cover on eBay in a while, maybe a year or two.
As far as what it's worth, I guess that depends on its condition and whether or not someone was willing to ship or only sell local, if that person was selling. I see 235s pulled for a swap and given away for free here in Texas, and the same engines selling for hundreds to a thousand plus in California where the demand is higher. I would expect the aftermarket stuff would have similar geographic variations in price or "worth" due to demand.
My best friend runs an Edmunds valve cover on the 235 in his 58 Apache.
JW, I think the tube was intended for coolant, but I recall seeing one plumbed for exhaust once too.
