TI=Troubled Ignition.
The grand sports had a tubular frame as opposed to the boxed frame that the mid years came with from the factory.
Hood, flares, doors handles, windows,
oil cooler, rear deck, lights, scoops, side vents, rear end, quarters, gas filler location, and nose were different on the body.
You would be better off just buying one of the kits for around 20-30grand rather than trying to convert a midyear corvette, even if it was a base model. When i initially saw the grand sport on the superformance website, it was advertised at close to a 100 grand. I hope that was for a complete car with drivetrain.