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When I was looking into cams, one of my critera is that they could not require upgraded springs/retainers. This is what I found out;
With HKS (and their variants Buddy Club, GSC, etc.) with 10.8 mm (in) and 10.2mm (exh) of lift, upgraded springs are not required if you keep the RPM's below 7400.
If your reving higher, even with the prementioned cams, upgraded springs are highly recommended.
If the lift specs are bumped up just a tad, like in Comp cams' 119100 with 11.0mm (in) and 10.4mm (exh) of lift, upgraded springs are required if your going to rev past red line/7000 RPM's.
Any cams with higher lift specs are going to require upgraded springs and retainers.
If your car is going to require springs and retainers is really up to you and what you do with your car. If your looking for all out power you need them. If your diciplined enough and keep the revs down you can get away without them.
I've been running straight 264's from GSC daily for 10,000 miles on the stock valvetain. I keep the RPM's below 7200 and I have no problems.
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