easy engine mounts
I'm no expert, but I do believe all 67-7? a-bodies share the same /6 k-frames and dimensions. So you should be okay.
However, the poster way up above said he used the thick rubber biscuit on the right side but found it to be too thick and had to use it on the left. Did he just make a mistake and say the wronog thing, or is his car slightly different? Given that these cars were welded together by humans, there are certain slight variations in lots of things. That's why they have adjustable devices on the steering and suspension to account for these slight imperfections.