De Tom,
I bought a new Holley 1850 600cfm.
This is marked as 'for off road use only' - but this is just to avoid the emissions legislation in some areas (e.g. USA and especially California). These older carb designs are not designed to meet current legislation.
For pre '75 cars here in the UK the law just demands a visual check of the smoke from the exhaust, no measurement.
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