Headers for 73 Duster with 451

Hi

I would like to know what under chassy headers will fit a 73 duster with a 451 B-engine with TFS heads? I really don't want to cut the car at all to put headers the car is a real clean original car.The car has no P/S and No P/B to worry about. It is getting the spool type mounts as well. I would like at least 1 7/8 and if can put in 2" would be better. Engine right now is in the 650HP range and is going to be driven both on track and street. I keep reading about TTI's some say they fit others say they don't, not sure if Hookers work or Dougs work either. ?? Any B Headers work?
What choices do I have? I seen Schumacher but not keen on Tri Y

Thank you very much

I`d call TTI and talk to them .