k frame question

I have a 1969 383 out of a b body the steering and k frame are messed up on the 71 dart but the body is perfect

OK, what are you saying here. Do you already have the big block "K" frame? There are a few easy conversion kits out there where you will be able to use your "B" body 383 in the Dart.
Some people just use the newer "A" body "K" frames that have the "spool" mount type engine mounts and use the newer big block spool type mounts.