IMO, the published specs are way to wide and allow poor handling.
The best that we have found with out Chevy are as follows and pretty common for rear drive vehicles in general for good, stable, handling.
Caster--as much positive as you can get up to 6 degrees, with .3- to .5* more on the right compared to the left.
Camber-- 1/8* to 1*4 degree positive as the suspension is set up to be positive progressive on compression
Toe---Always in, never out, set at 1/16 inch to 1/8 inch in. Computer aligners will need to convert to the degrees their machines use.
Good luck finding anyone who will align to the above as nearly all shops now will say you are good when the machine is "in the green" which is the way too wide factory specs.
I gave up and do my own alignments at home.
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