[Sunroof]

You know, if you added a turbo to the stock engine you might have lost some originality for this car. With unusual and rare models of this mark, folks who put out a lot of money in the name of collectibility and investment want just that; unmolested, original vehicles maybe even down to the stock radio. Many may frown on this turbo add-on unless of course the Calloway for 1983 offered a turbo option. As for value? I do not have clue aside from the fact you have a low mileage rare car.

You could contact the PCA in your region and they may help with the evaluation or provide some opinion on the vehicle.

good luck