The original paint used for the 'blackout paint treatment' in 1970 was Ford p/n 3254 (PPG #9381). A few pre-mixed paints are good approximations of the factory stuff including a urethane: Spies-Heckler (DuPont) 'Rallye matte black' #FP1004. You can try to replicate the texturing by using your favorite SG black paint with the so-called 'dry spray' method. Not a perfect match but looks close.