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on hks 264 or 272 cams, your stock valvetrain is fine. most evos ive seen rolling around with upgraded cams do not have v-spgs and retainers. but to answer your question, NO you dont HAVE to have upgraded valvetrain on 264 or 272. now if you get into 280s or an aggressive cam like JUN cams, you will definately need to upgrade your valves and retainers. i upgraded my valvetrain at the same time i did my cams and cam gears, but only because they were opening up the head anyways. i thought might as well do it now cuz i knew i was going to upgrade turbos soon. good luck!
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