I hope you know that the 950er is smaller than the 850er

This is a 950 which started out with a 1.378 stock venturi and was opened up to 1.405


This is a 850 and it has a 1.588 venturi


Both carb use the same baseplate with a 1.750 throttle plate.

The 1050 has a stock venturi of 1.688 and a 2.00 throttle bore, I hope this helps