Noot,
The carbs you are interested in buying were probably from a Bristol 405 .
LH54 means "London October 1954". The Jetting is standard 405 spec
100D2 carbs are B32 PBI-6 similar to above but have Accelerator pumps fitted .
Their Jetting standard is
Choke/Venturi 28mm
Mains 125
Air Corr 190
Pilot 55
Air Bleed 1.0
Pump 8.5
I found with the pump jets it always ran very rich during acceleration.
I blocked the pump jets and increased the mains .
After a few sessions with a mobile gas analyser and some trial and error the mixtures were very good through the range .Touring at 70mph it would achieve up to 28.5 mpg and that's fitted in a relatively heavy 400.
Geoff
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