Dave when I looked into these, it seemed that style of base you show has been observed on original 302 engines - the angle (~30 degrees down from horizontal) and orientation (clocking) of the breather tube on the underside was the difference. The other common style seen has the breather tube with a 90-degree bend and different clocking position, but I couldn't get a clear understanding if that was for a different engine (most likely imho) or a different supplier or a service replacement.
Ed (bertfam) has posted some great references from the various P&A catalogs which show just how many different assembly part numbers were used, and without the air cleaner base having a stamped number, it may never become any clearer than by trying to look at as many unrestored examples as possible.
The lid and silk-screening appear correct for the 69 MY, quite a lot of threads about the change from curved to straight print.