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Reading the post about the Mini with a blocked filter prompts me to ask what sort of filters you have fitted to your SU's. How does the car run on the road without them fitted? If the filters are wrong or they are fitted incorrectly, or have the gasket between the filter and the carb body wrongly fitted, the hole adjacent to the filter attachment holes could be covered up. This hole provides the vacuum for the carb pistons. If these or just one of them is blocked the pistons will hardly rise and so limit the revs available.
I'd also consider stuck advance/retard weights a possible culprit. They should rotate and snap back easily when you twist and release the rotor. The springs can also break or pop off which can also jam up the weights.
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