I uninstalled both Bitcoin Core and Armory and then reinstalled Bitcoin core in its default path. I let them sync and now I can see my current BTC balance!

If I understand it correctly, my next step is to install Bitcoin ABC on an external harddrive and let it sync. I can then set the path of Armory to where those blocks are and I will se my current BCH balance? Or do I need to install and run another instance of Armory?

EDIT: And it looks like I remembered it completely wrong about the HDD space needed. I believe when I first got Armory (2014) the total space needed was 2 times the blockchain size, since armory took up the same amount of space. Now it looks like this is not the case (or maybe it wasn't ever like that, and I just remember it wrong)