Stage 2 is rated for 700hp. If ur goal is 580 then yes you should build it. Although it all depends on how u look at it. I'm at 540/500 and no problems whatsoever. Stock block with supporting mods. Does the extra 40hp justify you spending the extra money to build? If so then by all means.
If it were me I'd build the block and go with a stage 3 and shoot for some good numbers. Look at Mr. Squeeze build and u can do something similar. Built motor will hold up fine.
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