You may wonder why anyone would do that to a Z-11 Impala, transfer the aluminum front end, etc., to a lighter weight 2-door sedan. The reason is simple. NHRA ran only two (or three, I can't remember) National Events in 1963. The only time that a Z-11 Impala had to run as an A/FX car was at one of those events. The majority of tracks around the nation typically permitted F/X cars to run as Super Stockers, even including NHRA sanctioned tracks, PROVIDING that they were full size sedans. This was true for cars of other brands too, such as the Swiss Cheese Panchos, the Dodge/Plymouth non-altered wheelbase cars, and Fords, full size sedans that had been set up as legal FX cars at NHRA National Events. Drag strips around the country did not have to obey or abide by all the NHRA S/S or FX rules in the early 60's, they could (and usually were) more flexible, such as allowing those small hood scoops, and other non-S/S or FX legal modifications. In fact, the majority of drag strips around the country in '63 did not even have a "Factory Experimental" class...