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Wow! I like VW history! I didn't know VW had a side draft carburetor either. I did know the Type III had EFI optional since 1968.
Yes, I plan on an oil heater, plus 0W-30 durring the winter. I'll be driving from -40°F (-40°C) up to 115°F (46°C) and 12,000ft above sea level down to sea level.
Yes, intake manifold pressure (or vacuum, depending on how you look at it) is dirrectly related to engine load. At full load in a naturally aspirated engine the intake manifold runs at just under ambient pressure (practically no vacuum). Yes, you can measure pressure in each cylinder individually with special spark plugs with pressure sensors. Also the air density between the spark gap can change the impedance. But for practical purposes it's easier to measure intake manifold pressure or mass air flow. Throttle angle also kind of works but isn't as precise.
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