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Flash's Convertible is a classic and not a muscle car because it has a standard engine base car.

The term muscle car started in the 60's and early 70's and was used for cars that had suspension upgrades, bigger engines, and performance packages above the standard base car. The 302 camaro with dual carbs was consider to be in the muscle car group.
A starndard 2 barrel carb car is not a muscle car. AMC tried to build a muscle car with bigger motor and up grades. It all had to do with horse power.

You are correct depending on what group you talk to it is a never ending discussion.