AFAIK there isn’t a library of 74 series parts but there are a fair number of examples around. Here is a set that I have from various places (some I have made, some I have collected from the forum or the net.)
74x125.fzpz
74x126.fzpz
74x367.fzpz
74AHCT125.fzpz
74HC00.fzpz
74HC47.fzpz
74HC165.fzpz
74HC4051.fzpz
74HCT245.fzpz
74LS04.fzpz
74LS08.fzpz
74LS32.fzpz
74LS74.fzpz
74LS86.fzpz
74LS393N.fzpz
A google search of the form “fritzing part 74ls86” will turn up anything that is available. You look to be using generic ICs, you can add labels to the pins by clicking Edit pin labels in Inspector (the lower right window.)
If you are willing to do a fair amount more work (and someone in the forum was doing such work as part of a project to create schematics from existing pc boards and has uploaded at least some of his parts) you can make custom parts where the individual sections can move independently in schematic like this (which is the 74x125.fzpz file in my list)
default load:
click on an element and move it around
with the internal logic being represented. Instructions on how to do that are available in this tutorial set on part making (but part making in general is fairly complex, and variable subparts are one of the more complex features!)
there are 10 or 11 parts to this series and I think one of them covers schematic subparts.
Peter