1966 Dart GT 273/235 HP 4 speed

I just looked up my fender tag and build sheet info. I have the "Rallye Package" (#368 on the build sheet) which includes HD rear springs, HD torsion bars, front sway bar, 6.95x14 special Blue Streak tires and wide rim wheels. It may also include HD shocks. I see in the option book that the Formula S package gets you much more and includes: Commando 273 4 barrel with single exhaust, tachometer, HD suspension package (sway bar,torsion bars, and HD leaf springs, Firm Ride Shocks, 6.95x14 Blue Streak tires with bolt on design wheel covers, and 14x5.5 wide rim wheels.
According to that information, the Formula S package was much more complete than the Dart Rallye package. I wonder if you could order the Rallye package on a 273/2 or slant 6 car or whether it had to be a 273/4 GT?