Web search measurements
Thanks for posting the photo. After performing a number of web searches, I came across potential measurements for 65-66. The author gave the the following reference measurements:
4.5" right of the center line of the trans tunnel and 15/16" forward of the seam at the floor to firewall pans. Drill a 1" hole
I also read that there may be a template in the electrical assembly manual.
65 Coupe - Restomod in process