I'm assuming they're the same headers that Kooks had.
$695 is the going rate for all headers, you need to run a $220 powermaster 6510 mini starter to use these...
Some info from an internet search:
Nick Fillipedes worked at Kooks and designed the headers for Oldsmobiles there, and are now sold by Dick Miller. He left there and is now running American Racing Headers also on Long Island, making Olds headers but being sold by MJ Proformance. Looks like AR is now selling them too...
Kooks stopped making Oldsmobile Headers because they demanded that 100 pairs of headers per year be sold off each Olds jig or they would scrap the project. That's 400 pairs a year since there were 4 jigs. The day that Nick Phillipedes left Kooks they made up their mind to not fill these quotas by refusing to sell to a WD they thought was a friend of Nicks (who sold a lot of headers off of each jig) and telling another WD they could no longer be a WD. They actually refused to fill a large order for Olds headers. That left one WD selling Olds headers and he could not sell that many headers by himself.