Can a gtx 980 fit in a CJ-341 Mid Tower case?????

I'm not 100% sure but I would say yes. The graphical car is not that big and it will probably fit in any mid tower (there may be some excepitons).

Judging by what I see on Google it will fit.
I once built a MSI R9 270X 4Gb DDR5 in a MARSGAMING MC0...no joke