1966 Frame Questions

[twoskies]

Ok
got a 1966 c10 short stepside, couldnt tell how bad it was till i got the bed off, thought the rearend was just out of alignment
got the bed off and measured from right behind cab to corner of frame on rear diagonally, one side measures 771/4 , other side drivers side 79
can see now where the frame took a hit right in front of rear drivers wheel
might check with frame shops to see if it can be fixed
or checking with you guys and gals to see what other frames are easy to swap
60-66 or go newer 71 or 72 to take advange of disc brakes and 5 lug
or will a square body frame work
probably go air bags on whatever frame i end up with

if anyone in Indiana has a frame, might try to check out if possible

Thank You for any help