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On a stock car stock tune The block shift the power band lower in the rpm range and can make a little more peak power as they shift the power band to where the engine is working more efficiently , stock.
Once you get tunes and headers then your usually chamging cam timings and also shifting where the engine is most efficient , this is often higher in the rpm range so the block work against this unless your headers and cam timings are designed to work with the blocks. Same deal with E85 it makes good power through the rpm band but does well over 5500, and the efficiency of engines with the blocks is starting to drop off past that rpm range unless you have made other specific changes to suit the blocks.
So in generall the blocks work well on stock untuned cars and their effectivness drops off as you add other mods
if your going to use blocks then you might be better with something like an ACE CS 400 header which is also designed for low midrange torque
talk to your tuner, see what they recomend
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