My memory may be fading with age, but it seems I read years ago that the yellow ZL-1 at one time was seized from a drug dealer in the southeastern US then sold at auction in Florida, it seems to me that the same article had referenced that the other ZL-1 was owned by one of the Unser brothers, as I wondered why he would not have bought the second when it was up for auction? Any of this fit with the history of these two cars?
Motown