WCCC has a template for the hood scoop, using an original Ram Air hood. Here is the 1970 version.
Okay I’ve edited this post about 3 times regarding the rear spoiler. I’m gonna do a little more research on that. 1970 is different from 1969 (side-to-side spacing of the pedestals). However, assuming the front-to-back spacing is the same, measuring from the front leading edge of the trunk lid to the first bolt hole would be 22-1/4" according to the 1969 document from Ford. You could make a line across the tunk at that distance, then figure out where the center is, and go from there.