1968 340 AVS 4425S carb replacement

Just thinkin'... if you still have the original carb, why not just rebuild it? Or have it rebuilt to "like new":
https://www.forabodiesonly.com/mopar/sidebarbanners/WOODRUFFCARBURETOR.jpg
My main concern with the Eddy carbs is that they're not a direct hookup to your factory choke mechanism, which it sounds like you want to retain. Not sayin' the "manual choke" models can't be made to work, but it isn't made to hook up to the factory choke (intended to be cable operated) so it would still require some mods...