Decision time: To Hemi Dart or not to Hemi Dart?
You've gone this far and it would be a shame to let your dream slip away. Two years ago I was where you are today. I lost all desire to finish the build. I set the project aside and waited for the "desire" to come back.
I've always had good luck buying parts from"racingingjunk.com". There are a couple of 426 Gen II Hemis in the $13K - $14K range on there right now.
Good luck with whatever you decide.