My 85 c-10 has 87,100 on it and it has been sitting in the woods since 2001. About two months ago through a battery in it to see if it would crank and dang if the 305 didnt actually fire right up, its a shame the Turbo 350 is blown.
My friend has a 79 c-20 that has 30,000 original miles on it 350/4 spd but the body has basically rotted off around the motor.