Okay... well if I were you, I'd consider the Edelbrocks. I just got a set of the 6032s (1.90/1.60 stud mount, emissions legal), and they list the springs as good upto 575 lift. So maybe those or the 6037's based on what rocker arms you have.
Trouble is they only have a 60cc chamber, but could be milled to get your 58cc chamber. I'm using them with an F-303 cam so I wanted a strong vavle sping too, and many people told me that the Edelbrocks were the way to go.
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