When I ran the Daimlers.
I seem to recall that I simply used what I could afford which was approximately the same size as whatever was on them, I never had any problems from doing that.
Incidentally, if you have an SU carburetor and it does not have the damper for the piston you can bore the piston ,make a damper to fit and get a bit more acceleration..
If the MPG does not matter to you you can also polish the needle which fits into the jet to get a few more horses, even a couple of thous off makes a difference,
I hope these vague hints and recollections help.
Regards David Powell.
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