Don donated the 58 and 6 tractors with the funds to build a storage building to a local historical association.
The remainder of his stuff is to be auctioned this Sat Dec 2. Google Don Holm estate sale.
There is a 409 engine listed. A few years ago he told me he had a 65 340hp and th400 he was wanting to know the value of.
Also a 58 four door and the nice pickup are on it.