Sounds like a really fun truck! Yeah I can't believe that there is no market for a short box street truck anymore. You don't see them much. I think the new Raptor is pretty cool but I doubt many of them really see a lot of off road use like they were built for. With a street truck you get to enjoy its performance and still have a nice driver. But maybe I'm just a biased Gen 1 Lightning owner.
The mustang 5.0 is rated somewhere north of 400 hp. I bet with some bolt ons and a tune you could do a little better than 360.