Has anybody thats running adjustable strut rods welded in support washers on the k member for the strut rods? I remember reading somewhere that someone said you can't reinforce the k member around the holes for the rods if you're running adjustable strut rods, but I can't seem to find the article. I'm looking to strengthen the k member and I've already welded in my own braces for the steering box mount and lower control arms. I just don't want to weld in the supports for the strut rods and run into a problem later when I'm trying to install them.

I have done those types of reinforcements on my k-frame. Unfortunately its a convoluted pain to put pictures here, on my end at least. If you pm me with your email, I'll send you many photos of what I did on mine. Also this is my build thread on For B Bodies Only which shows some but not all of what I did.
https://www.forbbodiesonly.com/moparforum/threads/updating-the-super-street-mopar.116131/

Pictures? Easy,
Click on circled area, select file to attach,
find file on your system,
click on it and wait for it to load.
you a can add up to 4 per post with a limit on the size (it will tell you the limit)

It would depend on what style adjustable rods you have, the ones that use stock strut bushings no problem, just shorten the front bushing the thickness of the washer that you weld to the frame. The firm feel rods will work, modified stock rods with shims for length work, some with a heim joint at the front may have issues. I would weld washers on the k-frame no question, see damage in that area all the time

I forgot to mention that I'm using the hotchkis rods with a heim joint.

It does not look like the stud is long enough to use another thick washer, it does have a big washer and thin bushings of its own so it should be fine, better than stock for sure.

We'll see if this works.

More. Looks like it worked! Anyway. I used my Rotabroach unit to cut some holes for rosette welding on the vertical face, outside surface of the k plus on the topside. The reason for the topside welds is that I boxed in the backside of the pocket with some pieces I cut so top, bottom and sides are boxed in on the backside. From there I added the washer. Also the vertical face welds are to better attach the factory backside reinforcement. The car is not done yet, so I can't give you any feedback on results.

Here are some shots of what else I did on the k. I added 120+ welds around the perimeter of the frame, factory was 30 or so. I used two different sized cutters on the idler arm bracket so I could get through the bracket and the first layer of the k so it would all get tied in together. I also added the skid plate. The topside of of the k still needs attention. Add some material to the steering box mount to solidify that area, trim off some excess material on the engine mount brackets etc. On the control arm areas, I cut material out so I could access the back side of the tubes to weld them. Put reinforcements on both sides of that area plus put the access windows back on.

More.