Last I recall in 2018 they were asking low $80's/offer. It had been for sale for quite awhile @ that point & remember thinking even then that mid $70s would be a reasonable deal but was out of my league. It languished but finally sold. I'm sure others on here know more history on the car. https://www.hemmings.com/listing/19...0554?utm_medium=email&utm_source=saved_search Link to the 2018 listing too: https://www.rkmotors.com/vehicles/2115/1970-buick-gs455-stage-1#
That took a long time to sell and I believe it was in the $71,900 range. Probably will bring close to $130 now though. Museum piece.