Here's another illustration.Everything I've seen so far indicates the EGR valve is on the intake manifold rather than a plate between the carb and manifold. (Apparently, I was thinking of a 1980 Ford 351M in my previous post.)
Note the linked illustration above has the Chrysler logo. Autozone illustrations tend to be more generic in nature, even when they imply they're specific.
The linked illustration is more complete in terms of vacuum system and hoses. It includes PCV, fuel vapor, and other systems, in addition to EGR. In that respect, it's helpful for bringing your engine back to OEM configuration.
Based on that illustration, the picture you originally posted was of the vacuum solenoid valve, vacuum amplifier, and (maybe) vacuum reservoir.
