Front floor jack points

It is my understanding that it's not good to use a floor jack on the K member on a 1973 Dodge Dart Sport 340. Recently I have jack each side on the frame rails just behind the wheel wells and then supported each side by jack stands. Is it better to use the floor jack lower control arm and then support them by jack stands? in my youth on my '71 Demon 318 I raised it by the K-member.