I have manual choke on my '76. It was on the car when I got it. I can't complain about how well it performs it's job, but I will complain about the workmanship of this particular conversion. I've seen some pics of other ZS carb'ed cars with manual choe conversions that are a heck of a lot better looking that what I have. The manual conversion on my car looks like nothing more than a disk notched in such a way to allow it to move the choke mechanism.
This is the first car I've owned with manual choke, and I hate to say it but I miss the convenience of auto choke. heh... I see new and rebuilt "to spec" ZS carbs on eBay all the time complete with auto-choke... and they're oh so tempting. One thing that would make me jump without hesitation is if someone were to make an electric choke mod for the ZS. For now, I think I'm just going to keep eyeing those ZS carbs on eBay.... heh