1973-1987 Chevy Extended Cab

[Free88]

I was wondering if anyone out there who may own one of these would send me a couple of measurements. I am needing the measurement of the extension from the door pillar to the back of the cab, and the length of the roof panel from the front to back starting at the edge of the windshield molding to the back edge of the cab.
Is there any where on the web where there are specifications for the measurements on these trucks. We are in the process of building one of these and are in the process of gathering info. Thanks