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OK, a bit off topic...For a 3.0 with 34mm venturis; typically Webers are jetted with 145 mains and 180 main air corrector jets to match the 34mm venturis and a 55-60 idle jet for a 3.0 engine. Routinely 110 idle air correctors are in the 40mm Webers used in these applications so this is what I'd start with. However the progression hole sizes and arrangements of the Zeniths don't match that of the IDA Webers so I'm not sure what would be a best fit. Your mains seem a bit large and the 185 air correctors may be trying to take away a bit of the upper RPM richness they provide although there isn't much difference between a 180 and a 185.
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OT but thanks for the numbers. Been researching what people have been running on their 3.0L as I am in the early stages of converting my CIS to Weber carbs.
From what I've found...
34mm vents
145/155/160/165 main jets (your number is the lowest here)
175-180 air correction jets
55/60/65 idle jets
F26/F3 emulsion tubes