using aftermarket valve springs with stock retainers
It depends on what kit you choose I would only use supertech's ,gsc,or kiggly's they make the best kits available..
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GSC's 5039 kit was *made* to be run with the stock seats/retainers. I put like 20k miles on mine, rev'd the stock bottom end to 8200 on Kelford272's. For the money on the stock bottom end, it cannot be beat!
Honestly, titanium retainers are a pretty pointless mod unless you're building a purpose built track car that'll be spending most of it's time at 7K+ rpm.



