i say buy another ls longblock a turbo kit and wet kit.
boost and spray it then you got an extra longblock for when you blow it up lol.
but serious if i was in your shoes i would boost the ls. lets be real here ls have longer gearing,lower c/r,and better tq., perfect for boost, and it will be a hell of alot more fun then drivin a slow b16 da around. and to mention cheaper. boost it FTW