Blaster What should I jet

Location
CT
I just finished assembling my b1. It has 62t cases 62t top end daul 44 from a 760. Carbs just rebuilt. Stock 760 jetting. It runs fine at 1/2 to wot. Seems like there is a major stumble from 1/4 to 1/2. Were you hit the gas and it wants to die. But once you get past it it runs excellent. Any advice would be appreciated.
 
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