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I'm new to engine building and I want to drop a small block V8 into a '04 LS edition. What would they run? Good places to get one? What other modifications would have to made, if any, to the vehicle? I have found the 5.3L LS4 V8 from the '08 SS edition, would this fit?

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to do that swap you woud need engine, trans, pcm, harness, and someway to mod the exsisting pedal for the drive by wire TB.
Stock WBody SS's run between 14.3-13.9.
You would prob be better off doing a topswap (as long as its a 3.8) from an 00+ GTP or 04/05 SS. they run about the same stock, and w/ a cam, ported blower, IC, would put you low 13s or 12s, would be easier and cheaper that route.
Figure on a little over $1000 for the topswap, 300 fo rthe cam, another 500-1000 for the IC...
 
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