Yes on the Doug's. I have them, fit great. '67 coupe, 455, factory power steering, TH400 auto.
I can even sell you a home made set of short "header mufflers" that would bolt on in case you need something to get you to the muffler shop (what I used them for).
Just do some internet shopping for them. I got my from Pacific Performance Racing about 2 years ago for $600 but they don't sell them anymore.
2012 Mustang Boss 302 #1918, Competition Orange. FGF replacement 2006 Mustang V6 Pony, Vista Blue. Factory ordered. 2019 BMW X3 (Titled to the wife, but I'm always driving it for her. So I'm claiming it) Old projects, gone but not forgotten: 1967 FB 400, original CA car. After 22 years of work, trashed by the guy who was supposed to paint it. I had to sell it. 1980 Turbo Trans Am 1970 Mustang fastback, 351C 4Bbl, auto 1988 Mustang GT, 5 speed 1983 F-150 4x4, built 302 1994 Chevy K2500 HD 4x4, 454 TBI