Need a favor from a tri-five chevy guy

I am fabbing up my exhaust and need to know how far below the rear frame rail the back bumper hangs so my tail pipe are in the right place. My car came with a station wagon bumper and I gave it to my brother for his sedan delivery project. I haven't ordered a new one yet. Thanks for the help guys! I have a 56 but I don't think it matters.

 

here's a couple of pics from the back of my 55 that may help - let me know if you need me to measure anything for you

 

No, that's exactly what I needed. Thanks!