Intake manifold question

There was a dual quad manifold for 318 Poly motor. I saw one on trademe.co.nz a few years back.
The other option would be the weiand WEI-7503 Hi Rise manifold for the 277-303-318 poly motors. Years back my Dad put one on his 318 powered Aussie valiant. the motor had a wee cam in it, but with that manifold and a 4bbl holley it really sang.
I may have read somewhere that they are no longer available. But it is listed in my 2005 PAW catalog.