You seem to be implying that the Super Commando 383-4 was not considered a HP engine. I disagree, although the RR 383-4 was rated at 335, IMO that doesn't mean the Super Commando 383-4 used in Fury's was not considered a HP engine also. From a technical perspective, the 330 Bhp engine had higher Bhp, higher torque, dual exhaust, and required Premium fuel compared to the 383-2 290 Bhp. From a Marketing perspective, Plymouth called there HP engines "Super Commando" and used the red lettered hood ornament on the 383-4 330 Bhp engines so they obviously considered it HP.
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