Strange drag brakes

I have them on my car. They cost about $600 new 10 years ago. If they are in good shape, rotors not warped and pads ok they should be worth $300 at least. What bolt pattern and spindles were they on, they make a few different ones. Great brakes for a drag car, but they are not designed for the heat street brakes generate.
The car was built as a drag car, but very streetable and am converting to a street/strip car. Pro Street of sorts, but not tubbed. I’ve done some price comparisons and $300 would be a bit light. Thanks for the input.

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