Feasibility of swapping a 3.8L into my 2.3L Mustang; or increasing the 2.3Ls power output?

To swap a 3.8L v6 into that mustang would be a significant amount of work as your looking at replacing motor mounts and you may need a different subframe which most people do when they change from the 2.3 to the 5.0. The money your going to spend putting that 3.8L into that mustang you could sell the 3.8 and get a 5.0 and swap it. You will have to change the computers and the trans as well or at least the bellhousing. Im not a hundred percent sure as I have never seen someone do this swap before.