6 liter iron block
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First: quantify "big power." Second: Forced Induction, nitrous, or all motor? If you're thinking upwards of 700hp, I would stick to .030 and under. Also, having the block sonic tested for casting flaws, voids, or weak spots isn't a bad idea either... It could save you a lot of money in the long run.
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4.030 to 4.040 for big spray usage or other Forced Induction or best reliablity and leaving room for prior rebuilds, etc. 4.060 is the max for N/A and 100 shot to play it safe BUT YOU MUST GET IT SONICE TESTED as many of the new blocks are to thin where it counts for the .060!