Im replaceing my 150k 22re"typical BHG due to loose chain" with a slightly newer 22re. just want to know if im forgetting any parts i should replace for better luck of a bright future.

Ignition
dist,cap,rotor,plugs,wires.
EFI
clean upper, lower,and throttle body, fuel injectors serviced.
block
timingchain,water pump, oil pump,thermostat,oil pressure sensor
clutch,new balancer, regrind flywheel.

 

Go ahead and do the oxygen sensor.
after 150,000 miles, it cant do anything but help.
Get the OEM plug in, not the universal.

 

looking at them now do i want before or after cat sensor. prices vary like razy anywhere from 30-90 dollars. Bosch any good?