My search skills are bringing the suck again today.
I remember an old post where someone had posted the bodyshop(I'd assume) blueprints for a Chevy frame. Factory diagrams with exact measurements.

I'd like to find a set of those plans, working on something and I'd rather not tear the truck in half to get all teh measurements.

Anyone remember what I'm talking about, or have access to some spec sheets?

Looking for anything 73-87 Blazer.

Thanks boys.

http://www.chuckschevytruckpages.com/framespecs.html

That's not the one I was thinking of, but I haven't seen it before.
Should do the job. Thanks man.