55.2-59 4l80e will it fit?

[Missyblue]

I need info you smart people 😆 plans changed and now researching.....I have a 4l80e mated to the 350 engine I plan to use
1. Will a 4l80e fit or need minor or major tunnel mods? I have a small hump it seems
2. My current rear is a 3.73 posi not sure gearing on the vehicle the trans came out of.....any issues you know of?
3. I know theres wiring and computer stuff that will have to happen....anyone pulled those from the donor vehicle or start from scratch with a new purchase?
Was searching for a 700r4 to avoid the wiring and computers but reading mixed reviews on those and benefits of the electronic ones so trying to decide my plan of attack.
Thanks!