Finally! I found this out. This optional Hemi engine can be ordered in every Coronet model in 1966. In the previous year you can only order Hemi Coronet using A990 package and it's only available in Coupe and Sedan model. In 1966, it's available in every model alongside the introduction of Street Hemi engine. In 1967, Hemi is available again but as dealer installed package only since the top engine in that model is 383. Probably this is the fastest Wagon in that year since it capable to hit 150 mph and hit 0-60 in high 5 sec. Surely, this car can crushed both Ford and Chevy fast wagon in that year.