413 swap

Im taking a 413 out of a late 60's motor home and swaping into my 71 dart. If i change the motor mounts for now will the k-member hold up to the additional eight and power? My goal for now is to just get it running. I know once its running and i try to make it go faster i will need to swap in something stronger but for now will the slant 6 k-member work?