Heavy Duty Clutch Pedal Assembly Value

I purchased a box of A body 4 speed parts from a guy in my town, and in the box was 3 separate clutch assemblies. (It was a big box, with 2 bell housings, Hurst shifter mechanism with shift rods, re-chromed shifter handle, and some small parts). I got to work by taking each one apart and taking them down to bare metal. They were then coated with rust inhibitor, the pins were greased, and bushings replaced.

It was during this time that I realized that one of the assemblies was a bit different than the other two. It had a larger over center spring that connected to a pin instead of the standard duty hook. It had a larger pivot pin for the brake pedal and a larger pin on the clutch pedal.

I was telling my father about the parts I got, and he quickly told me that it was most likely a heavy duty clutch assembly.

So, my reason for this post is to ask these questions...

Can anyone tell me:
1) Are these heavy duty clutch assemblies any more rare than the standard duty ones?
2) I am going to be using a McLeod or Centerforce clutch, which I understand does not need an over center spring. So, is there a benefit for me to keep the heavy duty assembly (without the spring), or would the standard duty perform at the same level?
3) Obviously, I don't need 3 clutch assemblies so I'll be selling 2. Any idea of what the heavy duty assembly is worth? Just a fair price, good for buyer and seller. Not eBay price.

Pics below... I've included one pic of the over center spring vs a standard duty spring. Also, forgot to mention that the clutch safety switch is included and the return spring functions.

Thank you for any input.

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