I don't want to get off topic and into an argument here but I don't think they clear "everything" as you claim imho. Here is my reasoning, there are problems with most headers and yes tti is a very good product, and yes they sound badass, and yes everyone raves about them. But In my opinion B-body Hedman's fit better than C-body TTI's. In our experience the TTI's we put on our 67 Fury II sedan we had to make modifications, and yes we had to make modifications to our B-body Hedman's also but not much as TTI. Both our B-body and C-body header cars do have mini starters, but with the C-body with TTI's we had to put a dent in the header to clear the spark plug boot so the boot could go into the plug itself but they cleared without other issures. The Hedman's we had to clear the steering box and transmission pan but they cleared without issues otherwise. Just one guys 2 cents