Not claiming to be an expert on hardware, although I have "built" 2 PCs, most recently in 2021. However FWIW, (1) I wouldn't buy a used graphics card, as you never know if it was used for mining, and (2) 550W power supply isn't much any more. I assume you can use something like pcpartpicker site to evaluate total power load with your proposed 4060Ti, these being listed as using about 160W.
MH