The Cobra, GT40 guys were quite the spectacle with what appeared to be a very professional group -- going at it neck and neck all week end. So, well done to Pete (Chunky) er "Rocket Man" for FTD and pulling the group together.
Looking at the natsoft results --the make of car and capacity in a few cases seems to be a wild guess
One had a 4000cc Windsor ??
One used to have a 5000cc windsor ??
One had a 4000cc Turbo --x 1.7 = 6800cc ??
etc