What PARTS did Hurst and Chrysler put in the Super Stock Barracuda & Dart not in other factory cars

Well maybe wrong thread, but what the heck...
I saw a picture of the engine compartment of Castaldo´s Dart on FB somewhere. Apparently taken when he picked up the car. It had the very same looking air cleaners on it, as we see here on the engine of Bagshaw´s Dart.
This make me draw the conclusion, these air cleaners were put on by Hurst.
Could be I´m the only one who didn´t knew… but still…
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