They already have a KB setup for the LSA. I guess I do have a clue what I am talking about. Also the turbo route would be easy especially considering the LSA is almost an LS3 with a supercharger. If the LS1 will hold over 714 rwhp with boost on a stock bottom end than the LSA will do it all day long.
Then KB would be the way to go. No need for rerouting the exhaust, turbo manifolds, plumbing, etc.. just unbolt the 1.9 and swap. On a GT500 it takes less than 2 hours.