Good luck with the trip guys, looks like a great trip!
Watch out for potholes and broken edges to the tarmac on the single track sections and whilst I had no contact issues with my Supra in May this year, those with lowered cars or front lips with limited clearance will need to take some care.
The number of tourists that use the Beallach na Ba in camper vans can be ridiculous and few drivers seem to know the rules of the road on single track roads. Beware of the steep drop off on the verges, when re-surfacing the road, they tend to put more and more tarmac on, so the drop off to the verge can be 6" plus! Far better to reverse to a passing place than risk the side skirts or front lip being ripped off
Enjoy the trip, the A87 is one of the best roads in Scotland with some fabulous fast sweeping bends and the best scenery around every bend.
Just remember to top up with super unleaded at the BP garage just after the Caol/Mallaig roundabout as you leave Fort William, incase there is very little of it out west of FW.