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If you have the LM7 I would say boost the balls off that baby all day long. As for the S475, I am pretty sure that would not be ideal for a drift setup. I had my S475 but never drove it. However on my buddies LS1 setup the boost kicked in at about 4500 RPM or so...you could expect that to be a little bit higher with a 5.3.
The L33 has proven to be effective as well but generally more expensive and rare to find. If you are going NA then yes the LS2 or LS3 would be a great choice. For that price I would personally look at the iron 6.0 as they can be had for cheaper and the weight situation never really bothered me (100 lbs or so difference) especially with the offset in power.
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