I've been involved with this discussion on the SCCA level in regards to their CAM class.
IMHO, a tire width rule is the simplest easiest way to separate the cars. My proposal was for 2 classes, one 275 series tires and under, the other for any car with wider tires. In their case the 3rd class for the 2 seaters is also appropriate and I don't have a problem with it either.
It really doesn't matter how much power you make or handle you have tuned into your car...if it's only got so much tire to grip the track, that's as fast as you are going to go. I see no need to further separate the body styles, model year, extent of mods...any further than tire size.
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Lance
1985 Monte Carlo SS Street Car
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