Never heard of such an item directly from Edelbrock ever.

Probably something someone ported out and then redrilled the intake boltholes to W2 configuration on their own.

To fully utilize the W2 ports, a race single-plane and race headers would be worth the upgrade.

On a different note, I wish I would have picked up those 2 LD4B's I passed on, FOR $35, at two different swapmeets years ago.