426 Wedge possible install challenges
I believe the end result would be a very cool ride. Maybe more easily doable if you had an original 383 big block Dart. I have to echo the cost of what Hero is saying but if it doesn't matter...ROCK IT. If cost is a huge consideration, it would be interesting to add up the actual cost of the new 426 wedge engine and trans and the projected costs from JY Hero. You could get a banging rebuild on your original 273 that would make that little Dart fly and keep your life simple and a lot of money in your pocket.