The power window circuit breaker was moved from the engine compartment to the passenger compartment.
However, this may have been after Avanti production ended.
Also, a second window stop was added during production.
Here is the link to the Hot Rod Magazine article about Mike Salamunovich and the Studependous.
You can post the article or provide a link to the HRM article about Jim Bergener and the Studependous.
https://www.hotrod.com/features/there-is-nothing-like-a-studebaker-december-1973-982-608-110-1
The article on R 5482 doesn't mention damaged pistons. According to the article Jim Bergener's car was called the Lethal Lark.
Mike Salamunovich raced the Studependous.
Is it the same car with different names and owners?