The jets aren't exactly cheap at around £80 the pair.
That is a bit rich for jets (pun intended), http://sucarb.co.uk/abk-090in-jet-needle-spring.html
What was the original reason for servicing the Carburettors were they running rich before?
If you have changed the needles did you swap the spring that mounts to the top of the needles over from the old ones?
I'm not sure what you're getting at with your hyperlink? Your link takes me to the needles, not the jets. The jets from Rimmers are just under £40 each.
Anyway, this car, and it's carbs, have been off the road for 26 years, so I have never heard it running. I have rebuilt the engine, carefully cleaned and reset the carbs and got it running. However, it is fantastically rich. The carb needles didn't look too good, so I bought new ones but they have made no difference. To answer your other question, yes I did transfer over the small springs on top of the needles.
I thought it might be the old fuel in the tank, which must have been 4-star leaded, but having swapped that for some new 97 octane unleaded it is still the same. Thinking about it, it's amazing that it started at all on the 26 year old fuel, but it did, quite easily. They don't make petrol like that any more!
The ignition timing is spot on, as is the camshaft timing. I am going to try new float needle valves as the old ones have a groove round the conical seat.
Thanks for the input. It all helps to organise my thoughts.