I am sure you have already considered this, but if you wanting more aggressive than an LT-1 camshaft, using "stiffer springs" you are risking lobe failure. You can combat to some extent by using edm lifters, and making sure you use a good high zinc oil.
Still, if I were going stiffer than stock springs, I think I would just go with a roller cam package. Just my .02 cents. Wish you luck either way.
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