When to replace oil pump & timing chain - OHV

[masospaghetti]

I don't have any indication that these parts are on the verge of failing, but what life can I expect out of these parts? My goal is a reliable vehicle and it currently has 200k on it, on what I think are original parts.

98 XLT, 4.0 OHV, 5-speed. Thanks all.

 

[masospaghetti]

Just an update, FYI

Got the timing cover off and the components look pretty good. Teeth aren't noticably worn on the sprockets, guide looks good. The tensioner guide has some minor wear and looks somewhat extended, so there's definitely some chain stretch here.

What am I doing wrong here to upload the file?