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Maybe if you leave it in there for a long time you could have an issue but for a flush I'd say no. My buddy did a flush with it years ago and never had any issues. I think the Prestone flush kits contain muriatic acid anyway.
I have a '66 Belvedere as well and I had cooling issues too. I had the radiator re-cored and the shop said that the radiator had about 80% buildup/blockage. The car is running nice and cool now.