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The 5.7 is significantly lighter than a small block not to mention a big block. Secondly you can easily run a 904 instead of the 727 and lose even more weight and put more of your HP to the wheels. Probably be about as fast as a mild big block and handle WAAAAAAAAY better and get better MPG(don't know how much you drive I am just mentioning it).

Your car will be close to 1000 lbs lighter than a challenger witch by the way can run very low 13s bone stock, you would be makeing more HP to boot.

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BS 1000lbs? Last I checked he'll be running aluminum heads, intake and probably H2O pump. Facts is facts the stock 5.7 makes about 340 hp and 375 lb·ft give or take.
"And the power plant is 56 pounds lighter than its predecessor."...the 360 magunum.
Were's that 1000 lbs at? It still has a cast iron block. Plus they make power higher in the rpms so he will need a expensive stall. The good stall for the newer Hemis start at $800!

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Thanks for jumping down my back with out ever paying atention to what I said.

Here it is in real simple english, An old challenger with a 5.7 and 904 will weigh close to 1000 lbs less than the 09 challenger. The 09 challenger will run very low 13s bone stock, now imagine with nearly 1000lbs less weight how much faster that same motor will propell a car

Now on top of that the 5.7 does make lots of power upstairs, but it is no slouch in the low RPM range,a factory high stall 904 converter will work great, there may be slightly better choices if you want to spend $800 (same with a 500 inch BB, it will drive through a stock converter)but for a nearly stock 5.7 with a carb conversion and headers it will work great.

XV motor sports gets 360 hp from them with a carb conversion with too small of a carb. Put on a bigger carb and headers and you will be close to 400hp. Heck a camand spring swap can net you 420hp in that configuration.