It will start easily, and idle fine after it warms up. However, if I take it for a drive (just around the block so far) it will stall when I let off the gas.
This is a common symptom of the throttle blades being too far closed and/or the mixture screws set too lean. This is often a by-product of too much Idle-Timing.
Altho the PCV could be faulty.
EDIT
Another possibility is a wrong "wet fuel level" in the bowl; likely low, but could be high as well.or a contaminant in the fuel, but this is less likely.
In any case, your carburator circuits are all designed to function, around a specific "wet" fuel level. The spec in "the Book" is a "dry" adjustment, designed to achieve that specific "wet" level. The spec is usually pretty accurate.
Whenever working on a cantankerous carb, this is always the first go-to.