You are correct. SCTA references are because we don't know different.
FIA
1 Up to 250 cm3
2 Over 250 cm3 to 350 cm3
3 Over 350 cm3 to 500 cm3
4 Over 500 cm3 to 750 cm3
5 Over 750 cm3 to 1100 cm3
6 Over 1100 cm3 to 1500 cm3
7 Over 1500 cm3 to 2000 cm3
8 Over 2000 cm3 to 3000 cm3
9 Over 3000 cm3 to 5000 cm3
10 Over 5000 cm3 to 8000 cm3
11 Over 8000 cm3
Group I : Reciprocating 2 or 4 stroke engine with supercharger
Group II : Reciprocating 2 or 4 stroke engine without supercharger
Group III : Diesel cycle engine with supercharger
Group IV : Diesel cycle engine without supercharger
Group V : Rotary engine with supercharger
Group VI : Rotary engine without supercharger
Group XV : Hydrogen reciprocating engine
Group VII : Solar powered
Group VIII : Electrical engine
Group IX : Turbine engine
Group X : Steam engine
Group XI : Hybrid engine
Group XIV: Fuel Cell engine
And that's it. Don't care what the car looks like.
Records at Bonneville are flying start 1km and mile. There are also standing start records from 1/4 mile through 5000 mile.