I found this listing on ePay for a modified HIPO 289 rebuild:
https://www.ebay.com/itm/289-HIPO-GT350-SHELBY-COBRA-K-CODE-ENGINE/323683659574?
Any knowledge here about the vendor or engine work?
Yes I know Tony well. He is a very good engine builder and well versed in Fords especially I make pistons for him from Boss 9s and cammers to 289s he does them all. As you can see from the picture he knows how they were "dressed".
Randy