The only difference is the Intercooler on the front of the core support. And if your going to use an Auto Rad coresupport I think they offer this as an additional option now days. The Harness, Air box and everything else will need to be built no matter what LS engine you run. The Front drive system is just 200 bucks more expensive then a standard bracket system. The Harness is just a bit more expensive then a standard LS3. Now the LS9 stuff is alot more expensive but it is a much better assembly but at double the cost.
I think this is the BEST BANG for the buck crate engine out there.
Rodger
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