the “fuel deflector” is to overcome the bias which would otherwise allow a disproportionate airflow into each cylinder, given the inlet tract is curved.
I’m not sure if any actual dimensions or settings actually exist – but the principle is the the forward edge of the “deflector” is bent slightly to divert a slightly greater proportion of the mixture toward the smaller radius of the inlet stub.
The guy best to advise would be Glyn Chambers, but unfortunately he’s not on the net. See if you can get an address from an old “Yowl”, or ring me on 01785 713862 and I’ll re-divert your call.
Stan Thomas.
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