Valiant vs Dart

I have a 75 PLymouth Valiant 2 door, totally stripped out, paint removed, ready for body work, I also have a rebuilt front suspension kmember set up for a big block, also a bored 30 440 rebuilt, with 727 w/shift kit, 2400 stall converter, narrow 8 3/4 rearend w/410 posi, basically a whole drive train ready to go, the problem being I just picked up a 72 dart swinger for next to nothing, really good shape, just a little work needed on the right front fender, my question is should I stop working on the Valiant and put all these goodies in the dart? or just keep working on the Valiant? I am a long way from being finished with the Valiant, but could have the dart running soon, please let me know what you think?​