K members for HiPo engines were supposed to have more complete welding and denoted by the washer welded to the front . My 340 car has the washer as did my 6 pak B-Body K-member. I never compared one side by side with a non HiPo one .
My slant 6 K-member looked like it was built in a prison, on a Friday afternoon or a Monday morning after a holiday. Lol,K members for HiPo engines were supposed to have more complete welding and denoted by the washer welded to the front . My 340 car has the washer as did my 6 pak B-Body K-member. I never compared one side by side with a non HiPo one .
I am putting an 8 pt cage and frame ties in the car, should be pretty stiff.While ypu have the car apert you should weld the body seams to reinforce the unibody beyond the meager spotwelds the factory did .