How far/high do you want it to rev?
What cam/valvetrain are you running?
The venturi size is directly linked to the rpm range a specific size motor will or is to run, not necessarily the size of the intake valve or carb.
V = 20 * sq.root(cyl-vol/1000 * max-rpm/1000)
for a 2332 and 8000rpm ...
V = 20 * sq.root(.583 *
V = 43.19 mm
A 45mm vent should be good for close to 8700 rpm, don't know how
drivable it will be on the street though.
Hope this helps,
TxT