Thought about a new thread for these, just going to lump them in here. These are hard to find but the opening bid is steep! I really want a set but no way at this price. I do know a set sold for close to $800. The add is also misleading about the need for spacers? I have a set of M/T (1964 only) based on these and ran them on 544127 SD heads with no problems, single gasket.
https://www.ebay.com/itm/Rare-Pontia...UAAOSw5gNfbTNG