it all depends on how diligent the maintenance has been all along... These motors (Buick v8) are really not stressed all that much from a bottom-end perspective in my mind and I've seen/heard them going 200k+ with only the "usual" headgasket and waterpump issues over time.
When I did mine, the engine had 133k on it, had never been apart, but was religiously maintained by the original owner (I am the 2nd owner as of 133k miles). The cylinder walls still had the factory cross-hatching visible with no other scuffing, etc. Cam wasn't even brown from age, lifters had only ever-so-slight wear so I left them alone. No sludge anywhere in the block, valley or valve cover gaskets or rocker shafts. Proof that good care and feeding greatly increases the longevity of these and any engines...
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'95 RRC LWB, '05 Suburban Z71 (not stock), '94 F350 (only the cab shell & rear bumper is original), '62 International 404 tractor (red & white) & many other project cars in the past!
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