Hope this is in the right forum, sorry if not.

I need some help choosing a tranny for my project. It will be a 2500 lb DD 2 seater roadster. I have a complete 89 5.0 5-spd mustang to donate parts to it. I really wanted to go manual trans but I just don't see the footwells being comfortable with 3 pedals down there. So,
1. approximately how much can i sell my T-5 complete for?
2. I want to be able to go carbed if the EFI doesn't fit, so which tranny should i get: AOD, AOD-E, 4R70W, or other? I want OD because i'll be doing a lot of highway driving.

What are the considerations for each?

Thanks