A lot of over 3 litre cars come under the HMC guise Ray. But there are some, such as MkI and MkII Jaguar, for example, that have a racing history but would look out of place in a muscle car grid, and whose owners would likely prefer to not be racing in a muscle car grid. Therefore, cars like these that are over 3 litre but not HMC, would be added to the eligibility list for HSC.