Will a 1969 Chevy truck frame fit 1952 3100 body?

No, a 1969 Chevy truck frame will not fit a 1952 Chevy 3100 body. The frames are significantly different in size, width, and mounting points. The 1952 frame is much narrower and shorter than the later model. You'd need a 1950s-era frame to be compatible. Attempting to adapt a 1969 frame would require extensive, and likely impractical, custom fabrication.