I am in need of a set of big block motor mounts. I believe the last set I got came off of a 1977 Dodge Royal Monaco. I'm sure there are many others that will fit. I am putting a 440 into a Duster and have already modified the K member.
Not to sidetrack the post, but I would love to see what you had to do to modify the K frame. I have a small block school K frame for my Dart and I am now planning on going big block. Very interested.