I had those on my 70 Swinger for years. Manual steering, mini starter, 904 automatic.
They will work, but you better have a custom exhaust guy with some skills and a bit of a sense of humor. The headers exit right above the center link so the pipes coming off the headers have to make a hard turn. I told my guy I don't care how it looks just see if you can make it work. It didn't look pretty and he made it work.
I just took those off my car and installed a set of Doug's. I realize it's an extra $400 for the Doug's, but that's really your best play. Here's a pic of the "down pipes" that were removed from my car.
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