Big Block K Member?

I'm trying to determine which K member is in my car. I've spent all morning looking at various pictures and am still confused. I'm looking to possibly install the QA1 K member and am trying to identify what motor mounts I would need.

It's in a 72 Duster that was originally a 318, but it currently has a 440 with a spool style mount, so I know it's at least a 73+ K member. It's currently using what appear to be factory B or C body engine mounts, P/N 3817116 and 3817117 as well and my steering is for a 72 as well, center link, pitman and idler.

Does the fact that it using factory big block mounts, mean that it's a big block K member? Was there an A body spool style big block K member? I see there is also a DC version too?

Here's a couple pics, sorry the drivers side ones aren't very good, it's the best I can do with it in the car.

Thanks for any help you can offer.

Driver Side

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Passenger Side

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