Bill,
I think the only information that the NHRA has listed on the 66' D-Dart is that it was listed from the factory as a Super Stock Package.
It was listed in the car description from Dodge as equipped with
a Super Stock 66 Engine.
S.C. 364 (Special Order Engine)
That's what the NHRA is going by?
But, in 1966 the only Super Stock class in the NHRA was S/S or S/SA.
Of course the car is listed as a D-Dart. And designated for the D/Stock
class by the NHRA. As built, the car met the legal requirements.
Weight 2946 and horsepower 275.
Whether 50 cars were actually built is still debateable. Back then, it appears that as long as a VIN #'s list with 50 cars produced was sent to the NHRA, the car could be approved for the class designated. Nobody did any in depth investigation. Some paper-shuffling probably occurred
on the D-Dart production, accidentally-on-pupose.
The D-Dart, (Super Stock Package) is really a misnomer. Now, if the
current 273/235 was (re-rated to 210 HP), maybe and quite possibly the
273/275 D-Dart could at least have a (250 HP re-factor). At least, thats
a start in the right direction. But, who wants to run that car. Are they
any 1966 Darts left in America. Probably easier to find a DeLorean
PC
accidentally-on-purpose.