Good advice above.
FWIW:
1. I'd take a good look at the battery cable connections there at the battery. If corrosion is evident, remove cables, wire brush them and add a corrosion inhibitor (avail any parts store) after you reconnect.
2. I don't go crazy with engine air filter replacement, but it's a good idea to inspect it for reasonable cleanliness at ea oil change.
3. If your coolant is really old, you might want to drain it and refill with Ford coolant. Reason: The coolant has a compound in it that prevents corrosion of internal aluminum parts ............ like the heater core; and that compound gets "used up" over time. You really, really don't want a heater core leak. When I did mine on my old rig I just drained all I could from the radiator and engine block (easy access on the V-10) then refilled.....no "flush" per se. At that time you could buy Ford coolant concentrate from the dealer and add distilled water........considerable savings.
Good times and safe travels..........