1991 Chevy Corvette HELP MY CAR IS LIKE NEW

AS YOU CAN SEE my car has very few miles. It has not been driven in awhile. Therefore a local mechanic told me the motor was cooked. Maybe you can give me some more encouraging news. The car starts ok. After running for about 10-15 minutes, you can hear a ticking sound and then it starts running really rough. The mechanic said that just sitting around can damage the walls because the fluids were not circulating. He is not a Corvette specialist, so I need some info from one. Maybe if you think there is some better news, you can recommend a mechanic in my area. I am in zip code 02053, Medway Ma. The mechanic also mentioned that the noise could be that the bearings were damaged. Please send me your opinion.