I've seen a couple like that and cut one apart and redid it for a guy to make it right. That's one reason I am a bit critical at times. I have had too many screwed up messes brought to me to be straightened out or corrected over the years be it engine, suspension,brakes or what not.
I'm not positive how accurate this is but this link shows what is supposed to be the proper factory alignment specs for camaros of all years.
http://www.ls1.com/forums/f66/factor...ird-gto-24065/
I'll say right now that I don't like that much camber in the front end. I set them at 1/2 positive on the left wheel and 1/4 positive on the right wheel. That gave the best all around tire wear and they drove straight. Usually I went with 1 degree positive caster but on rigs that saw more freeway miles I bumped it up to 1-1/2 or 2. That was with street tires in the 70's and 80's for what you would call daily drivers. Unless you are racing you don't need much more caster and you don't want wild negative camber like a lot of ricky racer types push because they see it on road course cars.
The offset shafts probably aren't a waste of money as you can just add more shims if they give you too much positive camber. In all the years I did front ends I probably only put in 5 sets of them not counting tri 5 Chevy cars. Those almost always need offset shafts. The subframes we are putting under trucks now were under new cars when I was working on them. The ones that gave problems were pretty well abused and one had been though a wreck.