When we first picked-up the car I tried rubbing a pencil across these numbers to make them "pop" more, but the entire car was subject to a pretty heavy re-spray in the mid '80's that makes this info a little hard to see. If memory serves it's cleaner/easier to make out on the inner side of the fender.
Please recall this is NOT my car, but rather one that belongs to a very near and dear friend who is currently hospitalized, and I hope to get it back into his possession (and out of my hair!) ASAP.