Pete, Photos were taken at Roger Sortino's place in Washington State during a get-together he had to view a '63 Biscayne he built for the MM. The Impala was a Sport Coupe. Just a super nice low mileage day-1 original.
Mark, You have your history accurate. There may have been 2 of those 2x4 intakes cast by Winters, which does indicate a possible intention by Chevy to continue it's drag race program (following the Z-11). There was supposedly some reference printed (possibly in a Roger Huntington magazine editorial) which stated Chevy's intention and that the option was to be called Z-33. Roger created the car that "could have been" just for the fun of it. (although I think he should have used an Impala).
Here are a couple more shots I took.
Verne
PS: Roger is also the owner of the Terry Prince & Frank Sanders Z-11s that I posted photos of on the York Reunion thread.