Different computers

I was just wondering what all of these different computer codes were like the "P"... whatever or the LA3. I know where there is an untouched turbo coupe with the intercooler and everything. The only thing taken off is the air cleaner plastic elbow to the scoop in the fender taken by my dad. The car is sitting in a junkyard and hopefully by Monday, no one will have been down there to get it. Is it worth it getting the turbo, manifold, computer, injectors and the Vane meter, etc? Thanks