LD4B how good and how rare what are they worth?

LD4B has the perfect size ports to match up to the stock 318 heads, no turbulence there. Plus they are dual plain, aluminum made by Edelbrock for mopar with mopar part numbers. Built for the square bore carbs like the Edelbrocks.

I grab them when I find them.

Great for the back in the day nostalgia people too, with great performance.