Need a frame

[c30]

Last weekend I bought a 67 k10 shortbed.
The bed came separate and there is a wooden flatbed on it.
The entire truck is in incredible condition. Clean, no rust.
Got it for a good price because it had a "reconstructed" title.
The vin indicated that it was a C10 at birth. Not a big deal.
Problem is that it was mounted on a squarebody, k10 frame.
The kickup on the frame, under the rear of the cab, is too far forward.
The truck has a forward rake and it will never line up with the bed without an estimated 4 to 6 inch body lift under the core support.

Not sure what it takes to convert a c10 frame to a k10 frame.