Screw the heims in as far as they will go. And then back them out to get the wheels/tires to run straight up and down or slightly out at the bottom. You only want a couple of degrees of camber to straight up. Just stand behind the rig and eyeball it and you will get close enough.

The idea is to get as much heim engagement as possible for strength reasons.

Hopefully you have dumped the crappy aluminum links. Those things suck and break WAAAAAAY too easily.