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L18_B110
Thanks for your kind words in a previous post, & yes, you are absolutely right. About the only other thing to watch for in a used carb is the amount of wear in the throttle shaft & its bushes. If the carb sucks air at this point it upsets the low end tuning.
If you are using the Hitachi / Datsun carbs [recomended] you should check both your Nissan dealer & Repco for repair kits.

They are in fact quite simple to rebuild & are well sized to the engine. I used plain old ordinary engine oil in the dampers which probably reduced my acceleration times by a nanosecond or two, but most of my driving was longer distance cruising, so i figured it wasn't a problem for me, & besides, i was lazy.

The quality of genuine SU carb construction seemed to vary with the class of car that they were used on. The 1-1/8 carb on my '52 Morris Minor [oh the shame of it] was rubbish, but the ones from a Jag are very nice. I'm told that the throttle shafts in Bentley ones ride on roller bearings, but i've never owned a Bentley, so i cant say for sure.

Fix 'em right, fit 'em right, tune 'em right, & they will be good friends for many years.
Chris