I wouldnt worry about it being castrol.
10w30 is rare in this country as we never really used it, and when we did it was high shear fuel economy A1/B1 oil, which isnt suitable for engines like yours.
I dare say 10w40 would be ok, might be easier to source a classic car oil in that viscosity.
Ill try and have a nosy about see what may be appropriate...
In terms of zddp an A3/B4 has sufficient levels, but some of the detergents can be iffy with old engines, though mainly those which havent ever run modern oils or been rebuilt as the detergents break up solidified matter/sludge from dark corners of the engine and cause 'oil-clots' to circulate and block/restrict flow. Modern oils can be quite ok though, it just depends.
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