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Don't let the cam specs fool you. It's easy to have similar duration and lift numbers, yet have a very different cam grind. Jun and Toda are often imitated, but never duplicated. Even if you compare the two, the specs look nearly identical. But ask anyone who's ever tuned them, and they'll tell you that the two are very different in the way they behave.
As for the valvetrain, same deal. All springs and retainers are not created equal. Just because the spring is titanium doesn't mean that the spring rate is as high as a Toda/Portflow spring, or the retainer is as light.
When truly building a head, don't cut corners. How pissed are you gonna be when you drop a valve and toast the whole thing?
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