Many thanks for answering for me. I normally include the proper filter numbers with every sales receipt. I hope I did not skip one.
You can use any classic Chevy filter, with the #60A23 R&Z adapter. As long as the GM filter used has a 13/16"-16 thread and the filter does not have one of those nasty anti-drain back valves. This includes NAPA #1061, #1069, #1794, or anything similar. All Minneapolis-Moline, and Twin City, engines flow the filter oil from the outside to the inside. This is the direction Purolator chose when they invented the engine oil filter. General Motors engines flow the filter oil from the center, out. The "anti-drain back valve" will not allow flow through the filter.