some 32/36 carbs have sleeved main discharge nozzles, those sometimes loosen up and spin around causing lean running. will idle fine but run lean at all other throttle openings/engine loads. throw those out and replace with full cast ones.
 
Lean smells very strong also, so don't assume its rich unless you are familiar with both smells. 
 
cheers 

Shep, the weber has a series of small holes around the butterfly. On small throttle movements they are gradually uncovered to vary metering. They block easily being so small. Try removing the aircleaner and ragging the carb. Grab a sizable rag which cant be drawn into the carb, an old t shirt us good. wrap it into a tight ball, bring the revs up and jam the rag over the throat of the carby. By blocking the air flow it puts a big vacuum on the fuel jets a draws extra fuel through the jers helping to flush out any fine particles. The motor will stall fron the extra fuel; so hold the accelerator wide open when trying to start again to clear this. Have you checked for Vacuum leaks. Inlet gaskets, vacuum lines & worn throttle shafts will all result in accelaration stumbles.

So, Ive managed to score a free standard weber-manifold etc off a TF Cortina that has only done 75,000kms ! It was a  1 owner before a mate bought it and pulled the 2 litre out to put in a 302, 9 inch etc etc so Im going to fit that carby but I will still pull down the problem weber and have a look at it. I want the Choke installed again anyway so I can start it up when its cold.
      Interesting you mention vacuum leaks. I was thinking of this because, the brakes, ( which were rebuilt and serviced by the previous owner who did a 1st class resto on the car ) ,  don't have much power and at first I suspected crappy pads and discks ( as these weren't replaced in the resto ) but I started thinking maybe the vacuum booster isn't getting the needed vacuum , or its leaking vacuum.

Hi Mick,
I've just read this and it is interesting to read all the responses,
To put in a choke is not going change how it goes through round abouts,
A choke will lift the idle when cold because of the little lumpy cam and compression.
Unlike modern cars where we jump in, just kick em over and go, no warming up.
With the flat spot or hesitation, have you put a different carb on it yet or not ?
I just had twin 45 webbers recond. for $294.00 at the carburettor specialist at Burwood.
The carby on your engine was never pulled apart and recond. by me in the rebuild,
Jim
 
 

Hey Jim,
        Yeah, I just want the choke for slightly easier cold starts! I was planning on getting it rebuilt by a carb specialist but then when you add the cost of the choke parts ( I would use all new bits ) its getting up to the price of a new carb. Then I got the chance to grab this Cortina carb so its a logical step to clean that one and put it on first . May or may not solve the slight hesitation but it will cost me nothing to try.
       Hows the RS going ? Rally packs going great!
                      Shep