Here's a template if you want to cut the hood like the original WO23.

https://www.ebay.com/itm/1966-1967-WO23-RO23-426-Race-Hemi-Oval-Hood-Template/253393614521?

Here's the plate, the seller is a Moparts member.

https://www.ebay.com/itm/1966-67-RO23-WO23-426-Race-Hemi-Underhood-Plate/253443293644?