I used to run 225/50/15's and I don't/can't run LCA bumpstops. I had those adapters and wide sway bar on my Cuda when I had a 68 K-member on it. With that setup the K-member would just thud a parking lot crub return. Not a scrape, just hit it dead on and stopped the car. I have some scrapes on the stock depth trans pan from those days.
Right now with the 245/50/15's lowest point of K-frame is 5 13/16" from the ground.