I'd look into the E-Rod engine line. It has everything you need to swap a LSX engine into an older RWD car. They are a bit pricey but everything is new and complete. The LS3 is stout for a 3200 lbs car with a basic SLA coil spring suspension. The car wasn't designed to handle 430 hp from the factory. You should consider upgrading the suspension if you really want to complete the swap correctly.
http://www.chevroletperformance.com/...ction=overview
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2011 Summit White Camaro 1SS/RS
-6.2 LS3, TR6060, 3.45, G80
2004 Black Silverado 1500 2WD Regular Cab, Short Bed
-5.3 LM7, 4L60E, 3.42, G80
2014 White Caprice PPV
-6.0 L77, 6L80E, 2.92, G80
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