64-66 vs 67-69 barracuda front suspension

What all changed between a 66 barracuda’s suspension and front frame rail geometry and the 67?
I intend to put a control freak suspension system in my 66 but they only have a kit for the 67-69. I’m not opposed to modifying either the suspension or the frame to make it fit but knowing what needs to change before I put money down and have it taking up space in my shop would be a great help