Steering box and headers

Just wondering what steering boxes any of you have had luck with. I've got headers and BBC. When looking at reviews for some of the 14:1 and 12:1 boxes, several people have mentioned that the boxes are tight against headers and some have had to dent them to fit. I've been looking at Classic Performance and Borgeson on Summit website and that's where the reviews have come from. I had to remove my current box to get the headers out. I am pulling the motor and having it rebuilt. The last box was an aftermarket that has always had a slow, weeping leak that I never could identify so I thought now would be a great time to change since all other leaks will be taken care of (also putting in a new tremec tkx). Thanks for any advice!

Rich