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.
You may end up with the only '67 Dart with factory Sirius XM and Navigation since the UConnect is part of the computer system. ;-)