as always its hard to say. working on carbies and especially dellorto's it comes down to the experience of the operator on the given carb, vehicle and the jets, emulsion tubes etc he has available.
get your complete engine spec, capacity, cam, head work, exhaust etc and then ask others here on the site what jets etc they use, it should get you VERY close.
if that does not work call Graham Russell as he will have some dellorto specs im sure..
Grant
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