They look like Mikuni butterfly pumpers to me. RUN, don't walk, away!
Nobody likes Mikuni butterfly pumpers. Convert to Mikuni slide carbs, best way to go.
Same size should work, plug one of the outputs and use a dual port pump. That'll simplify your system and make it much easier to work on and reliable.
Raising sleds from the dead in north central MA.
'70 Ski-Doo Olympique 12/3 - The Yellow Bullet
'71 Arctic Cat Panther 303 - Wankle Panther
'78 Arctic Cat Pantera 5000 - Back from the dead!
'79 Polaris Cobra 340 - Back from the dead!
'95 Ski-Doo Grand Touring SE 670