I saw the LD4B stamped on the top of the manifold as it was sitting in the bottom of a box, which is why I asked him about it. His story didn't add up because I figured the W2 heads would probably need much larger ports and a single plane design. He seemed pretty unsure about it.
Anyway, the same guy also had a used Edelbrock Performer 2176 my buddy picked up for $75. Kind of funny, no more than 10' away Mancini was selling new 2176 Performers for $215.