i would also suggest that if you haven't ever changed the vacuum hoses in the system, you might want to consider doing that regardless of what you find. the hose kit (i suggest the one dr rebuild sells) is pretty easy to install and could be the best $50.00 you spend. one of the problems that the system has is the deterioration of the hoses themselves allowing "seepage" through the micro cracks you can't even see, making repair a real frustrating situation. you might also want to check each of the hoses where it seats on a fitting. the ends have a tendency to dry out and crack creating problems.
if you decide to restore the system, i would also suggest that you replace the check valve and filter in the system. they are located in the main vacuum line roughly behind the distributor.
the most simple way to inspect and replace the accordian boot and the seal on the actuators if that becomes ncecessary is through the front grill openings after removing the grills. you don't need to remove anything but the grills to make the inspection of both the boot (which you can pull forward to inspect the seal). if they need to be replaced, they can be replaced with the actuators in place by simply removing the clevis pin, unscrewing the clevis itself and removing the old boot and seal and replacing them. there are a lot of threads here on the headlight system, repair, and replacement. just do a search using that as the keyword..
hope some of that might help you a bit.
