determinate the year of an altezza????? help pleaseeeee

hey folks, im 17 im a newbie..i live down here in dominican republic..i have a altezza rs200 z edition...i want 2 know if some of you know the way to exactly know the year of a altezza???? and...what is better...to make my engine(3s ge) turbo or changing my engine 2 a 2jz???