In your first picture, the boss on the intake manifoild just to the left of the carburettor is intended as a site for drilling a vacuum point. The traditional technique is to drill with a grease covered drill bit to trap the alloy shavings, but removing the carburettor will make it easy to remove both them and the cuttings from tapping the hole, as well as actually tapping it. In any case, a few alloy cuttings getting into the combustion chamber is very unlikely to cause any issues.
Decide what diameter vacuum hose you want to use, and get a fitting sized for that, then a tap for the fitting.
John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
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