The LS1 is all aluminum, that's why it weighs less. Not sure if they have an aluminum 4.6, 302, or basic 350. Id also stay away from carbuerators, personally. I have tuned a few four barrels before, and it can be great when tuned properly, but Fuel Injection is MUCH EASIER. The only down side to EFI is usually the wiring, which isn't a problem here.
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