Your first hurdle would be to find an matx LGA775 board that's in good condition to overclock. Used boards might not hold up in 2023. Second hurdle would be the front panel connectivity. That board's notorious for having some weird front panel pinouts. The other would be that you'd have been better off just sourcing a build with parts from Asus, Gigabyte, MSI, EVGA or their ilk, not a prebuilt, would've helped keep costs down, perhaps.
You're also going to come across bad thermals due to the overclocking in 2023, then change the case out eventually for better airflow. You're already walking into that avenue where it's no longer the prebuilt that you got.