Gonna do the 0411 ECM swap in my 96 yukon. figured be easier to tune the engine with the Whipple, and if/when/ever build the 406 to put in over mailing the 96's ECM to someone. Also be going with a 4L80. Found this site, looking to see if the info is accurate....
http://lt1swap.com/1996_vortec_5.7/index.htm
http://lt1swap.com/1996_vortec_5.7/index.htm