Makes sense while you're there to do the difficult to get to jobs. I was just planning on changing my daughter's low 75 -80s thermostat but as you say, might as well tackle the other jobs (I'd already done the spark plugs).
I'd suggest going the whole distance now, tilting the upper manifold allowing oil to drip out, maybe some rinsing with white spirit, same with the throttle housing and the rubber bellows. I'm wondering if some of this re-gurgitated mix of condensate and oil is making it's way into your engine hence the blue smoke. That's the theory isn't it that crankcase gases get re-introduced into the engine for burning, that the gases pick up a fair amount of sludge on their way could account for the blue smoke.
With all parts of the air intake / breather system clean it'll be interesting to see if the problem with blue smoke reappears - please let us know.
Regards
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