Mike, The outfit selling Durant/Continental Valves on Ebay is American Vintage Parts....I spoke with them this morning and they have their valvs springs in another building and will let me know if they have the springs....I see that they still have 4 intake/exhaust valves for our A-22s on ebay as well as 6 intake valves for several of our 6 cylinder models.
On your engine rebuild don't forget that JPpistons in Australia will have in stock or make you a modern cam ground 3 ring piston assembly, which would include piston, pin, and rings in whatever standard or oversize you may want, The turn around time is good and their prices are not that bad.

Where Are You From? Yuma,AZ / Leavenworth,WA

Do You own a car built by Durant? Several

Thanks Bill & Rick;
The machine shop should let me know what they need in the next couple of months and I'll reach out to them.

Where Are You From? Oviedo, Florida

Do You own a car built by Durant? 1928 Durant Model 65