My last truck was a 2000, 5.4, Super Cab XLT, 4X4. A great truck and the only issues I ever had was one set of plugs and one alternator in 130,000 miles.
Unfortunately, the frame and underside was much worse than yours from the Michigan and Ohio winter salt.
So, I got rid of it and got a used but unsalted 2004 that will last me numerous more years.
Good luck on your restoration and keep the photos coming. Looking good.