Edelbrock LD4B

Yes no and no! The D4B was designed for the 64 and 65 273's. The LD4B was a re-designed D4B for use on the 66 and newer 273 and 318 engines. The ports are the same on the 273 and 318 heads. The Edelbrock is a dual plane manifold that works very well on both engines.

Thanks. I forgot when the changeover occured.