TTI header woes

While I agree that TTI headers usually fit far better than any of their competitors, every thing from the car to the headers is made by people and thus subject to tolerance stack in one degree or another. There was a time when everything was basically generic and you had to make everything fit. Yes, it sucks to pay $1000 for headers and then have problems but you are putting a modern engine in a classic car and there is no way any manufacturer can make a part such as headers that is going to fit without issue 100% of the time.