72 Dart Swinger 3.6L Pentastar +T5

I’m so new here that I haven’t reviewed the whole build. Guess I’ll soon find out what “too bad it wasn’t easier” means. I’m very interested in the lighter front end/handling aspect combined with 300hp and very good mpg. If I could get all that with a simple slant 6 build I would, but after a bunch of researching it looks like 1959 technology is still..1959 technology.
For most It would be transmission and the electronics.