1987 Toyota Landcruiser timing gear cover and oil seal

I am replacing the timing gear oil seal on the timing gear cover, along with the timing gear cover gasket. Do I need to replace the gasket on the plate behind the timing gears? and if so, how do I do that? It would seam like a lot of added work just to replace a another gasket that may not be leaking. Or is it somthing that should be done any way> since I am not exactly sure what to do in order to get the timing gears off of the front of the motor.
Jim