Painting of 1979 300 SD

I am in the process of having the car painted in another country and would like to inquire if you would recommend the one stage or the two stage process. Because I am buying the paint, how many quarts do you think I will need, using urethane medium reducer, plus activator. The paint being used is called Val-Spar. The 1979 300 SD originally used a one stage process and the vehicle will be striped of all chrome hand sanded as there is no body work to be done and the original paint is just starting to form small check marks due to the aging. Thank You

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