Putting the Lambo doors on a firebird, if this is what you want, I'd say, go for it. After all, it is your car. Installing the hinge kit and other things you will need is a job that should be done by someone who knows what they are doing.
It will cost a pretty good amount of $$$$. And when it's time to sell your car, it won't add any value to the firebird. In fact, many people looking to buy a firebird would be turned off by the door modification.