Ok, now to understand what you are dealing with, you have venturi that are smallish, around the size of what you'd find on a 600cfm carb. But the throttle plates are what a 750cfm carb like a 3310 would run. The lowest end of the venturi is enlarged so the throttle plates clear.
List number 4224-s
Type 4160 660CS
Primary
Float Side hung brass
Booster .144 Straight leg
Pump nozzle .025 Center Squirter
Pump type and cam 50cc Cam #336 whitish orange
Idle air bleed .070
High speed bleed .028
Metering block# 5913
Main Jet 76
Power valve none
PVCR na
Emulsion 2 @ .026 each side
Kill Bleed none, emulsion tube, .028 feed
Idle Feed restriction .038
Needle and seat .110
Venturi size
Throttle plate size 172/173
Secondary
Mechanical or Vacuum? Mechanical roller
Spring color na
Diapghram length na
Float Side hung brass
Booster .144 Straight leg
Pump Nozzle same as primary
Pump type and cam
Idle air bleed .031
High speed bleed .021
Metering block/plate# 12
Idle Feed Restriction .031
Jet size .076
Needle and seat .110
You can see the venturi here:
IMG_0835 by
Drew Pojedinec, on Flickr
IMG_0876 by
Drew Pojedinec, on Flickr