The QA1 LCA’s are smaller in profile pretty much everywhere compared to the stock LCA’s. I can’t imagine there being s clearance issue with the QA1 LCA’s to a brake kit that clears the stock stuff.
As for the UCA travel, a lot of tubular UCA’s require a little clearance to be cut from the UCA mounts. You have to check the clearance. The trimming is from an area that doesn’t add strength to the mounts, so as long as the trimming is done intelligently it won’t cause any issues. Having run UCA’s with heims on the street I wouldn’t do it again, the best I’ve gotten out of them are 10k miles. I guess for low mileage or track only cars it’s ok, but bushings are better for the street.