Following the above preliminary instructions

I just discovered (thanks 7wow) that the butterflies on No 2 are not fully closed even when the balance screw is "off" and the accelerator cable released - or is it, I need to check that "release" b r b yes even with accelerator cable totally released the butterflies can be pushed more closed, though it is the balance adjusting mechanism holding them "open" that bit, by the looks of it. I say this because I'm sure I recall checking this when they were off the car. How to adjust the base position of the balancing mechanism... ?  exploring.

So, can't figure out if it is possible or even desirable to adjust the spindle to linkage aspect, so I have "cheated" in that while the balance adjusting screw is supposed to be fully released, I can screw it in and hold it where it holds the rear butterflies shut while not affecting the front carb. Thus the Manometer readings still suggest (a bit) more air is being allowed in to the front carb, although it now responds to changes of the mixture and air compensation. I did test (squirt) cold start everywhere, a little only each time and no engine response at all. So whatever, if anything, is leaking air, I haven't found it, yet. Maybe I should tighten all the carb mounting nuts by one turn and see if that does anything. 

Anyway, its six degrees C here and the car is not getting to operating temperature so while I can get "legal" emissions it seems like a waste of time for now. I also seem to recall the best readings were at 85C. Also I have increased the idle target rpm to 1,000 from 950 as the engine runs better and just seems happier. Far as I know this is acceptable for the test. It's quite frustrating as before all this happened, so a few weeks ago I had way better readings - but at 85c.

So we need warmer weather (which is forecast) or dry roads and no rain to get to operating temp.

Yes I have googled it and at 6c we are likely to have worse CO2, CO and HC all because its cold.