A couple days ago I was trying to reorganize a bunch of my parts hoard. I was moving intake manifolds around and noticed the difference between the ports on 2 manifolds. I was pretty sure they were both Edelbrock LD 4Bs made for the small port 273 and 318 heads, so I pulled them out and compared them. One was a relatively late one as indicated by the shape of the carb mount, the older one was a square bore mount with no extra plate required and had the Chrysler (Hustle Stuff?) part number...
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