Up for auction is a single 1965 HiPo 289 Cylinder Head
https://www.ebay.com/itm/234058229885
Date code is 5H23 (August 23rd, 1965)
21 cast in the corner, double dot 289, cast in spring cups, screw in stud mounts
The cylinder head was repaired/welded prior to my ownership
Feel free to read the full item description on eBay.