sb tuning problems

The real problem being is the stalling .
The 1050 when i got the car back idles and drives fantastic . Idling at 750rpm like a dream. And all the way through the revs and stabs on the throttle.

I dont see how the carb size is a problem when it goes through so well.

Except running rich by the plugs , which may be causing it to stall after not getting enough spark.