I also found these valve cover clips for the temp sender wire. They look very familiar, but it looks like my '58 Vette has them. However, they'd work well with aluminum valve covers and possibly steel on these trucks.
https://www.corvettecentral.com/c3-6...n-valve-302055
Sorry for the subject change...
EDIT: After checking further, I think my original valve covers had/have clips welded on to the left valve cover. I'll have to check.