Edelbrock LD4B

IfItsGotWheels said
As I understand the LD4B manifold was designed for use on the 273 back in the 60's. Port sizes on the 273 heads are smaller than your 318. Just like everything else, manifold technology has advanced in the last 40 yrs. IMHO you'd be stepping backwards switching manifolds.
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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.