Quote Originally Posted by Greg Amy View Post
In the spirit of IIDSYCTYC, where can/do we infer that it's anything but the base model, and where can/do we infer options are allowed? What is the base assumption for IIDSYCTYC?
The base assumption is that if a car is on the spec line, it includes all variations of the specific year(s) and model(s) listed "...as offered for sale in the United States", with no other limitations, unless specifically prohibited in the "Notes" column, or otherwise prohibited by the rules (e.g. "limited production" wings).

An example: the Volvo I race is listed in the ITCS as the '69-74 142/144 2.0. That line entry would therefore include the 1969 thru 1971 142S (carb'd), and the 1971 thru 1974 142E (injected). Via update/backdate, everyone runs the 1971 142E engine, as it's the only one with 10.5 to 1 CR and the "good" head. But wait a minute... that was an optional engine during the 1971 model year, so you're saying we can't legally use it???? I'll repeat myself here... I'll bet there are others.