Stock Bumper Height on 91 F150 4X4?

I want to find out the stock bumper height on my 91 F150 4X4. I am sure my front springs are collapsed some and want to get new coils. BUT I had a HD set of leaf springs put on the back and I think it raised it up a little more than normal. Also where do you measure to? I guess I technically want to know the ht for front and back stock.
Thanks in advance
Rob

Try this... Take a tape mesure (I know it isn't spelled right. It's late) and go from the middle of the wheel well to the ground for all four corners of the truck. In general on a truck the back should be a little higher then the front. While I'm in school monday, I'll get on alldata.com and check on the specs of the front end.... Hope this helped some