64-69 with align but the real difference is in the power steering box return fitting. 64-66 had 1/2 return and 67-69 has a 1/4 return. It’s best to stay with 64-66 if that’s what your car has or you’ll have to source a later return which isn’t impossible but can be tricky to setup.
Jake - on my 65 PS box, it takes a 5/8 return hose as does my pump and a 65 Imperial PS cooler I have - don’t think it’s 1/2 inch. I think the later stuff uses the 3/8 but since I’m not that familiar with 67-later I may be wrong.
