75 Dart Custom donor to 67 Dart GT Convertible

Hi, I am a newbie and have a 67 Dart GT convertible with a cracked 225 block and have access to a 75 Dart Custom with a newly rebuilt 67 or 68 318 as well as a new front end, disc brakes, front suspension and also equipped with power steering and a new k member. Is this all interchangeable? I know the powertrain is but not sure if the k member and front end/brakes are? All input would be appreciated.