Not sure when the LS engines started coming out, I'm sure one of the GM guys will jump in here with some good information for you. I'm more of a Ford guy.....

One of the members here, Stucool, has a Studeabaker that he recently put an LS engine in, he'd be a wealth of information on what you need and what it would cost...... Might want to send him a PM if he doesn't see your thread one of these first days....