The 6.0 Had many many issues. There are a number of fixes that should be done to make it a bit more reliable. EGR delete this will require a programmer to delete in pcm, new head gaskets and apr head studs,stc fitting on hi pressure oil pump, updated stand pipes for injectors
My son is a ford Tech and just bought an 06 F250 4x4 that had all the fixes done to a new motor Ford replaced for previous owner also a ford tech. The previous owner did all the upgrades. If done at retail at the dealer would have been in the $6K range. 3 for parts and 3 for labor.
Do not put in a chip, leave the motor with stock performance programming.
Only 67K you should be able to get a warranty on it and that may be wise. Feel free to PM me and I will be happy to try to answer any of your questions.
Many have had them and had no problems while too many have had endless issues.
My advice is learn the history of the truck and make sure you are getting a very good acquisition cost.
Just my 2 cents. I have stuck with my 99 F550 with the 7.3 which is bulletproof. would love to have the newer 6.7 but not willing to spend that kind of money.