LD4B - Chrysler part# 2836139 (?)
http://victorylibrary.com/graphics/LD4B.JPG
I'm pretty sure that the earlier version of the LD4B with the different angled bolt holes would have had a different part #. I'll post it if I find it.
Jeff gave me a hint with his AMC intake designation. Now that I think about it, I'm pretty sure the early Edelbrock 273 intake was called an D4B.