1974 8-seater microbus mechanical rebuild

[Mordred]

Excellent, the short answer is they are 1800 carbs and being 1974 that would go with the original 1800 engine. If Andy is on here he might like to fill in the rest of the info. He might even suggest that the main jets may be worth going up a size or 2 if highway running most of the time as that richens them at high revs.  They do lean out higher in the rev range.  I cant remember exactly what the standard size is but 132.5x for 1800 is familiar.

Looking at the blocked ports and tubes you had it looks like they might have given trouble of the years.  I am fairly confident the matching dizzy for that year and 1800 engine is 205P.  ( thats the last few digits in the part number on the side). 

Adrian