2002 Trailblazer engine swap

[02blazerls2ls1]

This. Is my first trailblazer
Its a 2002 ls 2wd i6 fully stock motor wise.i added dual pipes and cut the mufflers off to make it sound sportier. But now i wanna swap my motor for more power and speed.im a mechanic and i will be doing all the work myself just need help on which motor to get,with minimal cutomization. All input is welcome I look forward to hearing and learning from you guys thanks.
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