am I going in the wrong direction?

Hey guys things are going well with the 67 dart gt convertible but I just got offered a 2015 hemi with 5 speed auto trans. with 37000k miles with a new cam and lifters which required removing the heads which were checked and cleaned at a shop. it comes with everything to install in my car ,wiring, computer, sensors, everything for the price of $2500 . I would be removing the original 6 and replacing it with the hemi. what are your thoughts about price ,fit ,overall project to convert. thanks.