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The upside to the 5.7/6.0 Gen-III/IV GM motors over the 4.3 is bags of cheap reliable torque and HP without any exotic (i.e. Expensive) parts. The 5.3 is also a great option, but it comes down to what you can find for a donor.
The drive-by-wire versions run without hesitation in hot/cold, wet/dry, from the moment you turn the key and have lots of grunt from about 800 RPM up. A lot of guys go through the effort of changing them to cable throttles, but as easy as the ETC setup is to install, I wouldn't bother.
Good luck.
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