As you may know Many 1958 and some early '59 models had neck angles so shallow, that the bottoms of the ABR 1 bridges had to be shaved to get their actions low enough. Remember, the necks/neck tenons were fit and adjusted by hand, so there is definitely some variation in the neck angles. Hope this helps
Neck angle issues were corrected by around Nov 58. I've owned four from that period, and all had good neck angles.
On bridges, the very early guitars had bridges shaved to allow for shallow neck angle, but before the neck angle matter was corrected, Gibson also had shallow bridges made, where the mould was thinner, rather than shaving the bridge down. They're quite rare, but they are factory original. I have a few.