I need to tune up my truck 1989 F150 4.9L I-6. What things should I buy to do this. I am gonna buy a K&N filter and what else?

 

Spark Plugs
Spark Plug Wires
Distributor Cap & Rotor
Fuel Filter
Air Filter
PCV
Oil & Filter

Inspect Drive Belt (serpentine belt), Hoses, Radiator Fluid, Battery, Brake Fluid, Power Steering Fluid, Transmission and Transfer Case Fluid, Differential Lubricant, etc... I always find something else to replace.