Welcome.
That 40th looks to be in decent shape under all that mud, a good thorough detailing and it will look 10 times better.
There might be a bit more wrong with it than just a pulley and a belt, I would suggest doing a thorough check on the engine and trans, check all off the fluids, use a scan tool if there was a check engine light at any point, post a thread with anything you find, there is a lot of people on here that know these cars better than their own names. Lol
Outside of that, just keep reading. Lol