Opinions wanted for replacement Rear Spring selection. Thank you

I will post a photo of my 70. The previous owner added a single leaf to the stock springs. I think it ame from a pick up because it is quite thick. It did raise the rear but it does ride pretty solid. Not bad just pretty stiff. I would all it a 1" over stock. (at least) You can see how much tire is showing with a 255/60-15 on 15x7 wheels.

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