K frame removal on 73 Dart 318. How hard is It?

Yes I have to do the bushings next also. I have one UCA bolt that is rusted to the inner sleeve of the bushing, preventing the bolt from coming out. Any time you remove a set of bolts or screws it seems there is always one that is troublesome. Cutting the bolt is a last resort. I am going to try penetrating oil and maybe some heat, although I don't know if the heat will get to where it needs to be.
My 73 Dart was made in Canada also. Not a Canadian market car. It was sold new in the USA.