Jim uses a sledgehammer to fix the kitchen sink. lol! (Sorry Jim! Had to razz you a bit!)
We've all been there and had to do it at times.
I think you are about right on the 2" to 2.5". It's been awhile since I've seen this discussion. (Not on this forum) And, at this point, It's not high priority on my list of "To Do's". I'm still working on suspension mounts and re-fabricating some frame sections. Working more on front suspension right now than rear.
Anyway, The angle finder that I bought from Sears runs around $8.00 to $10.00. Should work out fine when I get back to working on the rear section of the car again.
Steve