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You will need to use the valve springs the individual manufacturers recommend for their cams for warranty issues. If you have the money, a retro hydraulic roller is a no brainer. Rocker ratio depends on the cam, how much lift, piston clearances, etc. When you start getting into the 400 hp range, rethink that stock 10-bolt. Depending on your cam choice and build, 2500 stall may not be a little short. JMO
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