I've been researching the possibility of taking a Grand AM 3400 and replacing my 2.0Turbo. Is this a feasible task?
 
No one has ever put a 3400 in a second gen. 
Lol. Yes it's possible. Check out V6z24.com or 60degreev6.com
 
  
 
Why you wanting to ditch the 2 liter?
 
89 355 s10 blazer
94 sunbird, 2.0 turbo 5spd getrag swap
Turbonetics turbo, intercooler, E85 20psi