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I remember the problems I'd have trying to get my older carburetted cars to pass their emissions tests. Had an '85 Toyota pickup that I'd done a lot of work on (over several years) - rings, valves, rebuilt carb, replaced all the vacuum lines - and it'd still barely squeak through. Also had some interesting times starting in cold weather, or after being parked for a month or two.
Finally traded it for an '88: almost exactly the same truck except that the engine is EFI. Have done no engine work on it in the four years I've had it. Goes through smog checks with numbers way at the low end of the range, and starts first time, every time.
Oh, yeah, and then there are the joys of mixture control (and carb icing, though that's seldom a problem here) on a carburetted Piper Cherokee...
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