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I checked them out. The chrome or polished one is for 71 and up. The 69 is black or stock AC Delco. I'm calling Jegs and Summit tomorrow to see if the Edelbrock endurashine is available for my engine.
i didnt like the limited options for corvette polished parts with pulleys and things so i bought a normal 350 water pump with standard 350 polished w/p pulley and crank pulley from summit. much easier with the standard sized w/p shaft and alot cheaper.
i run a stewart water pump in my '69 350. they have several different levels of water pumps. i just use the standard one. it looks good and flows much more than the stock pumps.