the cover sheet says to download several additional documents for complete datasheet info. I'm pretty sure the first one will tell you sink and source current limits for that logic family.
sinking or sourcing for an led is common. though I dont think you can get much current from the 4000 series. The TI parts are spec'd for something like 6.8 mA at 15V, less for lower Vdds
If you can manage a 5V system, the 74HC line can sink or source upwards of 30 mA per pin though total chip current max is like 70 mA.