align sub-frame and measure for coilovers

[clay69camaro]

I figured I would just do two questions in one thread instead of two seperate threads. I read a long time ago how to find number 2 but can't seem to find it anymore.

1. I want to make sure my sub frame is in my car correctly, lined up perfectly. It's a wayne due c4 subframe. how?

2. Next is where do I make my measurements to find compressed and extended height for coilovers? How do I simulate compressed? floorjack under the lower arm? and extended? I'll be using Proma Star QA1 Double Adjustable.

Thanks for the help