67s have a different receiver/drier and mounting bracket than 68-69s. The 67 receiver/drier is short/fat and mounts next to the condenser. In 68-69 the receiver/drier is taller and narrower and was moved to the passenger fender well.
If the system has been open or discharged for any length of time, the receiver/drier must be replaced. There is a desiccant bag inside that absorbs moisture. If open to the air, the desiccant will be come saturated. New receiver/driers do not look the same as the original GM units. If originality counts, there are some A/C shops that can cut open your original, replace the desiccant bag and weld it back up.
Note - I read in these threads AC Hose Clamps and Sealing Barrier Hose with Clamps on the Automotive AC Information forum http://www.autoacforum.com/ that the barbed hose fittings and worm drive hose clamps can leak if using the newer barrier hose (for R134a). There is a nylon liner inside the barrier hose that is not as compliant and does not seal as easily as the older style hose. I have not gotten my A/C running, so I haven't tried any of the proposed solutions in the threads.
In picture 1, you can see part of the rubber filler piece "masticated filler" that helps seal off the gap between the bumper bracket and the core support.
Picture 2 shows the receiver/drier and its mounting bracket.
Picture 3 shows the receiver drier and hoses from a different angle. The hose on the lower left comes from the compressor muffler and the hose on the upper left goes to the expansion valve at the evaporator. There is a foam sleeve over the lower hose to protect it from rubbing against the bumper bracket.
Pictures 4 and 5 show how the hoses are routed from the core support around to the engine bay. The lower hose is wedged against the bumper bracket and core support and the foam sleeve protects it.
