Stan,
When the late Ron Benham approached me about a rear engine roadster class he claimed history. I told him if the cars had a 90" wheel base and rear swing axles he may have an opportunity. Ron was shocked, "those cars were unsafe" he stated. My response - Duh, in Homer Simpson's best style.
In a couple of years Ron had a set of rules, support of the roadster class guys and a car on the track to support his cause. A few short years later we have what we now have. A whole lot of problems and as of yet a good definition of a roadster.
DW