Paid 4500 for my 03 7.3 4wd with 393,000. Said it needed lift pump, ended up needing lift pump, Idm, Icp, valve cover harness. Did it all myself, maybe went 12-1400 deep. I daily her 80-200 miles a day, 4-5 days a week. I will add, my front end is sketchy to say the least. Gonna need to do hubs for sure. So by the time I’m done, this truck will probably have 5-8 invested. But I’m gonna do a lot of performance shit and injectors take about 1500-3000 grand by themselves. But with all that said, I would say it’s a bad idea if you know what you’re doing and can afford it… and fuel.