The Zenith carburettor is easier to find, and easier to find parts for than the Solex, but the Solex may be slightly more trouble free. Apart from these points, there is little to choose between them.
The early Series 2 had a number of differences from later Series 2/2a, with most of the parts interchangeable - but the early parts are generally hard to find, if you want to be a stickler for originality! And most of the changes were improvements!
To note a couple of these - the drop arm on the bottom of the steering relay was beefed up - for good reason; I had one break on my 1958 Series 2! The early ones had screw controllers on the vent flaps = a much more elegant setup than the later lever type; But you try getting them closed in a hurry when you are on a dusty road and a car appears from the other direction or is overtaking you!
The aircleaners are readily available second hand, and could be bought from several of the suppliers here. There is not much that goes wrong with them that a clean, repaint, and possibly a new joint washer won't fix.
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