If you use a "low" Fender-style bridge the neck pocket should be 5/8" deep and no neckangle is required.
With a "tall" bridge like for instance a tune-o-matic-style bridge you have to angle the neck backwards to achieve the required low action.
To work out the neck angle place the bridge roughly in the
position it will eventually be in and set the saddles as low as
possible. If the bridge is mounted so that it doesn't touch the
body - because it is, for instance, supported by posts - insert a
shim of appropriate height under it. Then put a piece of wood left
over from cutting out the fingerboard on the top edge of the body
and lay a T-bevel (made up of two battens held together by a clamp)
on top of it and the saddles.
This is the required neck angle. The string action is adjusted later on by increasing the hight of the bridge (turning the posts).
Excerpt from my book Building Electric Guitars