The modified '73 Formula in post #1 is now listed on eBay.
https://www.ebay.com/itm/364238156959
It sold on BaT in May 2022 for $63,000. Now listed on eBay starting at $17,000 and no reserve. Seems odd.
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Bob
Park Ridge IL (Chicago suburb)
1974 Formula 455 - Ascot Silver