LD4B how good and how rare what are they worth?

When I researched it the intake seemed to be the preferred one for LA small runner heads. I bought one from a member in Canada I think. I paid about $225+- and I had to have
the head mating surfaces machined to clean up some pitting.
The good for my build, don't use a spread bore pattern intake with a square bore carburetor, adaptors be damned. The small runners for my heads and the dual plane construction.
I powder coated it and installed it without issue on my 273 build and have been very happy with it-full disclosure it is a fairly mild build but does 6000 RPM easily.