Yes, you definitely have the spark valve as these engines used a Holley "Loadamatic" distributor. Very likely the one on eBay is an industrial engine carburetor, those engines got a centrifugal advance distributor. I stand corrected on the Holley model, it's been 35 years since we sold the carburetor shop and close to that since I pulled the 223 out of my '58 and stuck a 312 and OD T85 in it.