My doomed 408 build

I spent the weekend, tidying things up in the engine bay. I have also done around another 150 miles on the car. I cruised around town and then did a small stint out into the open country. It was a fun and glorious day on the road, in an old squeaky rattle box MOPAR...
To note: I have a tremendous amount of body flex happening, When I'm at a stand still and tromp on it, the whole front of the car seems to twist up and to the right. I have also noted that the doors are growing gaps and are not closing nearly as well. What can I do to help with the flex? Any one have a link to a decent set of frame connectors? I will be ordering the frame pucks for the K-frame tonight when I get home.
I also am feeling quite a bit of squirm from the rear. It does not feel like it's the tires, but maybe some thing loose in the *** end. I have looked it over and am not seeing any thing out of place. or seen any thing loose.
My rear end is an 8 3/4 4:10 spool. I have the direct connection super stock springs and MOPAR performance rear shocks with traction bars.