i put a 97 lt1 in a 95 body and when i turn the key nothing happens what should i do?

kind of hard to tell from so little info. but i would say cheack all the wire conections battery anything you had to conect when you put the motor in the car and see if its done right other then that i dont know what to say.

You have to use EVERYTHING related to the 1997 LT-1 engine when You do the swap. This includes all Computers and Sensors Etc that goes with that engine. These are pretty simple swaps but ALL related items have go with the engine.

uncle bill is right if you only took the engine you need to get a computer for it too. And if your wiring harness is different that too. You may need to have the tranny reprogramed to work with this engine to, as they do more communicating between each other now.