I run a set of triple inch and three quater SUs on my 202, and have had drama after drama with them from day one.
I ended up rebuilding pretty much everything. New needles, new butterflies, new throttle shafts, new piston springs etc.
I still have problems with one of the carbies, no matter what we do or how many times we balance them and drop or raise the flats, its never run as perfect as the other two, its always too lean or too rich (usually the latter)
sometimes they can seem, perfect and still be rotten pains in the bum.
If you are chasing a vacuum pump to mess with, VK commodores, non injected ran a vacuum pump, lots of them are now seized up or have been sent to the scrap heap but a wreckers with any old VK vacationers or some of the other models with the black 202s (non injected remember) should have vacuum pumps, they ran them as part of emissions gear.