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Re: Doner vehicle for LS engine?
Buying a complete engine/trans/harness/PCM/pedal definitely makes things easier, but not impossible to piece it together. I have an LQ9 out of an 04 Escalade and put a 4L80E behind it. Factory harness, PCM, and pedal. Looking back, I could have put a 4L65E behind it (was factory in the escalade), but I went for the heavier 4L80E.
If you want to go Gen IV, the 6.0 engines made 345-360 HP stock. The van engines in that era did not have DOD/AFM so I see them as pretty desireable. Not a big deal, but Gen IV PCM's are a lot smaller and compact and no TAC module with Gen IV's.
It is getting harder to find low mileage Gen III engines, but if you do you can swap the cam and make 400 HP with an LQ4 or LQ9.
Things to avoid:
-4L60 transmissions
-LS4 engines - these were put in the Impala SS's and are not swap friendly.
Finding a factory high HP/TQ powertrain will cost you more for sure. The cam swap in my LQ9 cost me about $750 for the parts and a base tune. Also keep in mind that if you put a trans behind the engine that is not factory (what we call a segment swap), that's a change that will have to be made in the PCM.
I bought my engine off eBay with 110k miles and got a rebuilt 4L80E from Just Chevy Trucks.
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