If anyone is interested the following was seen by a friend on ebay a few days ago, & available until Sep't 23rd I think;
Y-Block Dual quad ECK manifold c/w 2 matching Holley 4000s, list 9510 # 1074-1 & 1074 2S. These are supposed to be matching dual quads with the vacuum secondaries. (?) Item #280153905870
Paul