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Do a compression test. Always start with the basics!!!!
Put a dial gauge and degree wheel on every lobe and check that the cam is correctly ground. You might have some sort of phasing cockup.
Cams usually prefer being run about 2 to 3 degrees advanced. Yours is a tad retarded although that isn't the main problem.
Does the carb have the appropriate spring in it, oil in it, a piston that isn't sticking, the right size main jet and one that's not worn? There's no such thing as an SU that's uncontrollably jetted. You can always get them as you want even if it means starting out with a very lean needle to get the bottom end right and polishing it down in the lathe to get the top end right. Just because there might not be an ideal needle off the shelf shouldn't be any hindrance to an operator who knows what he's doing.
Dave
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