Some Webers have water heated choke, some have electric choke, and
some have manual.
Manual is probably best all around.
You can put in an electronic ignition, no problem. But, the SUs are
good carbs so long as they are tuned properly.
They're not as easy to tune as the Weber down drafts and therefore
people over the years have considered a down draft
Weber to be an "upgrade". The Webers, both side and down draft, are
good carbs. But, they are not that much better than
the SUs that came with your car. Unless racing is your goal, stick
with the SUs.
If the car sat up for a while check the damper fluid in the carbs.
Your problem could be a sticking carb piston.
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