Just got home and checked the upper control arms per clay68c10. Contrary to what you said though, the 90 degree side is to the front, and the back has the angled side. But I have a 69 C10 here as well, and what is in the C20 matches what is in the C10. The C10 has a distinct rake to the rear side of the control arm, and the front side is the straight out side. Plus it matches the picture in this post here below:
http://67-72chevytrucks.com/vboard/s...d.php?t=400205
The photo of the upper arm in this picture definitely shows the angled edge to the rear, and the straight edge to the front. Right?
I think my control arms are in correctly....?