this info is from an old magazine article about the Vanke intake.
I used this as a starting point with my sock 625 cfm carbs and vanke modded intake, and it worked pretty good.

The jetting Vanke used was (probably with open headers);
rear carb
throttle side opposite side
primary stock .089 stock .089
Vanke .089 Vanke .104

Secondary stock .080 Stock .082
Vanke .089 Vanke .104

Metering rod
stock .0665 .058 Stock .0665 .058
Vanke .0665 .058 Vanke .071 .061

Front Carb
Primary jet stock .089 stock .089
Vanke .104 Vanke .104

Secondary Stock .1065? Stock .089
Vanke .1065 Vanke .095
Metering rod stock .071 .061 Stock .071 .061
Vanke .071 .061 Vanke .071 .061

The article also mentioned different pump clusters (carter # 48-294-s) different needle and seats (carter# 25-861-s) and different primary clusters (carter#58-902 and 58-903) the pump cluster orifice size is .075 and the needle and seat orifice is .111
Vanke stated this was all just a starting point and that the clusters were not all that important