The Dougs and TTI's look different. Can't miss it when you see them in or out of the car. The Dougs are nice. The TTI's are better for a higher performing engine. The stepped tubes are big in that area.
Super Comp Hookers do not hang below the front end linkage. I have a '73, 360 Cuda 4spd (Hence the screen name in part) and own Super Comp headers from Hooker. Excellent high performance headers.