You've probably already read the support article about "link" requirements, but just in case you haven't, here it is..............
The GTX 970 is listed as a supported GPU, your 980 should be fine.
Maybe ask the question that you want answered then.
"What FPS can I expect in Assetto Corsa on a Quest 2 using link on a PC with (insert specs here).
I don't use sims but my understanding is that they are quite demanding and you do have an entry level GPU for VR.