70-71 340 HP OEM Valve Covers

Mtrhead said

Passenger side heat shield and driver side wire loom is taller for four barrel provisions

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You could get a 340 two barrel?

Shouldn’t the ad be for 70-71 340 valve covers? If it was a 2 barrel, they would be 70-71 318 valve covers? What’s the significance of the ‘HP’??