Bad fuel distribultor very rarely results in uneven fuel delivery between injectors, but bad injectors surely will! So will leaking injector seals.

However, since you don't have any running problems (lumpy idle, hesitation on takeoff, etc), I would leave well enough alone until a problem develops.

If you do get symptoms of vacuum leaks or plugged injectors, change injectors, seals, and the seals between the manifold halves.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!