Those engines have been used up and are now very rare, so the vintage rules now allow and are considered a 6 liter class and she is currently fitted with a 5.7 liter (350cid) Chevrolet engine.
Miss California was built in 1969 for a series that was a marine version of the Trans Am road race series.The class used 5 liter engines like the Ford Boss 302cid and the Chevrolet DZ 302cid, which this boat originally ran.