Highly modified and/or Restored vehicles with uprated, non-period correct engine swaps, or engines from outside the original manufacturer, and/or vehicles with significant body customizations or conversions. Generally, Custom vehicles cannot be easily returned to their original factory specifications.

Due to the nature of this vehicle type, a consistent and accurate judgment on Originality is not feasible.

Vehicles that are returned to near factory specifications, through a process that goes beyond routine maintenance and upkeep. May include vehicles with modifications that preserve a period-correct engine and body, and/or vehicles that have been repaired after substantial damage.