Seems like a real nice guy if you two have been keeping in touch and all. Sell it back to him for some of the reasons below: 1.) Your rest asured he'll take care of the car...he has before in the past. 2.) Since the car was garaged alot anyways its like your getting more money for taking care of the car for him all these years. 3.) I'm sure if you ever go and visit, Since you two keep in touch, he wouldn't mind letting you take it for alittle spin for sentimental reasons of course. 4.) You can Invest in another Clean Z (Partially modded or not) and have fun with it while your making a profit. 5.) You know this offer wont come again from anyone else.