350 SDL vacuum pump

[GJEMD]

Hello, my first post. I own a 1990 350 SDL for 20 yrs. Currently 180,000. Factory rebuilt bottom end rods, bearings and head gasket @ 75,000 in 1997. Car has been boiler plate ever since. It has the original Vacuum pump. I have absolutely no problems. Cars runs and looks like new. I have been informed
there has been design improvements with the vacuum pump since 1990. It seems they can puke bearings into the timing chain without warning. I've also been told it happens after 200,000 miles. It looks like straight forward DIY. What is the consensus and any tips on this job. I will get a Peirburg pump. Thanks GJEMD