When you say "a sub frame swap" are you talking about the K member? Shouldn't the 273 bolt straight up to the Dart with the factory mounts? Both the /6 & the 273 used the same one in the 63 to 66 cars didn't they? Or are you talking about a real subframe swap? Sounds like a lot of extra work, but maybe I'm just misunderstanding something. :dontknow: It's certainly happend before. :tard: