I'm sure this question has been asked a thousand times before. Can i get an evo motor straight into my '03 OZ. And how difficult is it if possible. Or would a turbo kit be the easier simpler cheaper way to go?

no, the Evo motor will not bolt right in and it would be cheaper to sell your OZ and buy an evo than attempt the swap. Yes, a turbo kit would be a cheaper alternative, but with it your car would still only have 180-190 hp.