Just short of a "frame-off".
Replaced the (not original) engine with a long block crate engine, new intake manifold, carb (4bbl), ignition (HEI), steering box, power steering, ALL brake calipers, master cylinder, gutted the cabin and replaced everything (kept as much of the original dash, instruments and seat components as possible), re-sealed the Muncie M21, lotta body work (both doors), new gas tank, more body work, new paint and so on. It was a basket case.
I used Ekler's, Virginia Vettes, Doctor Rebuild, Advance Auto, Jamison's Custom Corvette (local) and Ebay.
Also did some minor (audio amp type circuits) enhancements to the original radio (AM only).