Headers in my early A body...HELP

I installed a set of Spitfires last year when I freshened up the motor in my '66 Barracuda, manual steering, originally a 4 speed, but has a T5 using a Quicktime bellhousing. They went in slick, had a 3 bolt collector flange, the muffler shop had a time working around the fork and so forth, but that's about it.