Hi Jason
I posted some pictures of the seats
http://canadianmilitarypattern.com/PostingPage2.html look at the top of the page for the links to the seat photos.
Just went out to the barn an put the angle gauge on the HUP seat with the truck floor sitting level the seat pan is angled 7 degrees from horizontal while the back is leaning back 16 1/2 degrees from vertical.
Cheers Phil