There's got to be an expert on these zenith carbs that willing to travel around the country/continent like John Cashman does for 61-67 Lincoln Continental convertibles (and similar Thunderbirds). I wonder if there's a market for a similar Mercedes Benz man. There simply aren't enough people that seem to know how to tune a dual-zenith carb anymore. I read and read and tried and tried on my 1970 250c. I couldn't even get it drivable, let alone running right. It was a worthwhile experience.
The weber carb conversion was something that even the Star Magazine did a write up on. Some people swear that dual zeniths are a good thing if you get them running right, but it seems far too often that once they aren't running right, getting them back to correct is a trial in academia.
Shouldn't there be something even better than dual carbs that would make sense in today's world? Shouldn't there be some type of modern fuel injection system that could be mounted on in place of dual carbs? They aren't small, so you'd think there'd be plenty of room to mount on a throttle body with a big ass electronic injector and some type of high pressure fuel pump. I don't know if that would be dangerous to put so close to the exhaust manifold, but that's where MB has their 1960's injection stuff.
I totally respect anyone who alters from stock on these dual-zeniths. I had one car that ran and drove ok. One that wouldn't run at all, and one that seemed to work really well. If not for the one that wouldn't run for me (which had lots of blow by), I'd think dual zeniths were ok, and sticking stock make most sense. Nope.
Dual weber conversion isn't exactly cheap, though.