i have a 1996 blazer 4.3 vortecand i am wanting to put the 5.7 vortecout of my 99 tahoe in it i put a new motor in my tahoe i rebuilt the motor and i was wondering if i would have to change the computer to keep the fuel injection and if i do. do i have to change the harness also

 

Considering that I believe the SCFI 5.7L Vortec motor stopped production in 97, this may be a bit more of a challenge...