It's not specifically the metering calibrations in the jets/rods/power piston springs, but things like "fuel enrichment solenoids", and other "fixes" for emissions/drivability situations as the emissions regulations got tighter and tighter. PLUS egr and air pumps.
In '73, you could have the "floor jets" in the intake manifold. These were jets which screwed into the heat crossover passage to allow "a controlled vacuum leak" (as our Chrysler service manager explained it) and "egr" without the later vacuum control. Kind of crude, but worked for what it was supposed to do.
While the fuel line might hook up the same, many vacuum hose nipples would be in the same place, the end result could be non-optimal. The other side of the deal could be actually finding the correct carb number item that's worth rebuilding.
What's on the engine now? Just curious.
CBODY67