"These rules are general in nature and may not apply to every car accepted by SVRA. It is not possible for SVRA to publish rules that accurately define the period authenticity for all eligible cars.
It is therefore the responsibility of each competitor to research the proper period specification for his car, and to present it as such. Supplemental Regulations (Spec Sheet) are published for most Makes & Models and they give specific details on permitted options and modifications. The (Spec Sheet) are to be used in conjunction with the General Rules and Regulations (GRR). When in conflict the (Spec Sheet) takes precedence. The Group Supplemental Regulations (GSR) for each Race Group contains details that apply to that group only and these should also be considered when preparing a car.
Proof of any unusual specification or configuration is the responsibility of the competitor. Updating or backdating within a recognized model (body type) production span is allowed as long as it does not conflict with the group eligibility time period. Continuation cars may be accepted, but they must be backdated to the eligibility period.
These are the resources and regulations that will help you prepare your car to compete with the SVRA:"