Tldr: need help understanding this mustang I bought.

Just the other week I purchased a 1995 mustang with a v6. Come to find out it has 97 3.8 with 98 top end (supposedly) a 2001 5spd auto and a 9in rear end out of a 04.

With all that being said, I'm new to mustangs in general. But on top of that, it doesn't seem like this car should have been built this way.

I'm just here looking for help on how I would go about rebuilding this car the best way for it