Who sells 1- 7/8 headers for 68 barracuda

Swapping my 360 in 68 fastback barracuda to 440 . Done plenty of research and phone calls to Tti & Schumacher and no one seems to have the 1 7/8 headers to fit A body with power steer.
Going through fenders is out of the question as I don't want to cut into the car.

My 440 is currently at 470- 500 hp with O. E heads. I want to be able to have a header were I can have the option to add 100hp through head / Cam / comp if I chose too in future.
Schumacher has them at 1 5/8. Which will kill any potential future power gain & TTi s bigger 2" maybe over flowing it.

What have others done in similar situation? Go custom? Is there any other company who does over the counter long tubes without sitting to low.