Body mount meausements

[c20pickup]

could somebody give me measurements of the three body mounts on a 70 chevy, i need the distance between the cab mount and frame mount on the back mounts, the front cab mount, and the core support to the front frame horn mount, i have new poly mounts all the way around but i believe i ave them in the wrong places because the can seems to sit forward to far, but being the fenders and bed are off the truck i have nothing to base it off of, thanks