[Exil]

From my personal installs I found that generally a header from a 64-67 A-body will fit a 68-72 A-body. The 64-67 have a little less room around the top A-arms on top. They have a curved transition going from the side rails of the frame to the cradle or X-member under the motor. Which takes up needed room in those areas.

The 68-72 have an almost 90 degree transition where the cradle meets the side rails.

So from what I have learned over the years is a set for 68-72 usually wont fit in those areas on a 64-67. I haven’t come across a set yet that of 64-67 that didn’t fit the 68-72. There may be some that don’t but I’ve never seen it yet.

I did just learn from another member hear about a week ago that the 455 70’-72’ A-bodys have longer frame motor mounts that hang about 2” off the back of the frame. So I personally don’t know in that situation.