Build help
As far as the parts... https://ls1tech.com/forums/forced-in...induction.html. You don't really need 6.0L heads, a cam, springs, timing chain, pushrods, head bolts or oil pump to get your car done and running. With that said they can def help provide better reliability. A wide band I would say is a good investment but not necessary if you're not tuning it yourself.
The biggest piece of advice I can give you is read, read, read. Look here for turbo builds and get on some gto forums and read the threads that people have made from their experiences on their builds.
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