Upper A arm Mounts

I've traded for a Camaro clip car that has the upper A arm mounts obviously butchered up by some wanna-b chassis builder. I'm cutting them off and have purchased new ones from Speedway. How do I locate them? Inward/outward, forward/rearward, Angular positioning of mounting holes? Please don't reference "from the top of the chassis" because that's been modified as well. I'd like a reference from the mounting locations of the lower a frames if possible. Thanks!

The easiest thing to do would be to measure a stock mount.Move it towards the center of the car to get the camber without a lot of shims.Keep the angle of the mount in relationship to the center of the car the same.You could slide it straight back a 1/2" to help get caster without alot of shims.