538177 casting for 389 or 421. I was intending to build a HO-type 350 with these, 1.88" /1.60" valves and advertised 69cc chamber would work well. Would require early style intake manifold and upgrade to modern pushrods. Never happened though, the car didn't work out. I have the valves and dual springs that the photo shows out, will include those to complete the pair.
Just wanted to see the valve seats for myself. No I will not take less. They must be factored in to whatever the price of your item is. The item "PONTIAC 389/421 CYLINDER HEADS PAIR 538177 cast iron OEM valve job complete" is in sale since Tuesday, April 23, 2019. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Engines & Components\Cylinder Heads & Parts".
The seller is "sstjean-half" and is located in Attleboro, Massachusetts. This item can be shipped to United States.