engine swap

I have a 94' thunderbird with a 3.8l v6. I also have a 89 5.0.....How hard is it going to be to swap them..



p.s. I also have the ecu, wiring harness, fuel pump assembly, and tranny.

if u take all the wiring and computer out of the 89 it shouldnt be too difficult but u will have to change the motor mounts if i remember right.