Cab measurement needed please

[msgross]

COuld someone double check my measurement with their cab? I need to know how far below the floor is from this line (or any given point on the rear of the cab. I just replaced my entire floor and used the L-brackets that my 68 has for the rear measurement. Just want to be sure that the rear of my floor doesn't need to come up.

The B-pillar patches that I have are about 1" high if I use the body lines, I have a feeling that they are just off...

thanks

this is the rear cab wall to the layered metal that holds the top of the gas tank... a window measurement would work as well...