Brian, at least get some narrow urethanes from SCC for the Citroen DS and bring for the initial run. No one is likely to have one and they were a real competitor. My Scalextric Mini Cooper is a modern release of the car you have, but without the roof rack and tires. I have narrow wheels from Pendle and SCC urethane tires. I also have a wide tire SRC Porsche 914/6 that would have competed against your Alpine 110 in 1971.
This event is bringing out the creative side of our usual Spec Class minds. Since the track only allows one car on the layout at a time, we are allowed to enter and run more than one car. I hope one of my cars is competitive, but all three are fun to drive. They have their magnets which makes them fun on the big track!!