Headers and Flowmaster exhaust 67 and later A body

I might be interested in the exhaust system I don't need headers I have TTI do you think the exhaust will work with TTI headers. I also have a set of Doug Thorley but I don't want to change them.
Ridge

Won't work without taking to muffler shop. The TTI headers are longer than the ones I have. If fact I'm about 90% sure I had the exhaust on with TTI headers but when I changed to these headers the muffler shop added some pipe on to make them work.

I will seperate if someone buys the exhaust first. Thinking $250.00 on the mufflers and exhaust only.