BBC carb suggestion
If you have the luxury, try the 1050 dominator.Maybe even the HP. They seem to work well on the street and the track. I even had an older 2 circuit nas car style 1050 and it never gimped or had a hesitation or transition problem, it was on 2 bbc's. A 10 to 1 489 roller motor with steel heads, and the 496. 12 to 1 alum headed 700 Hp BBC dynoed and the air fuel ratio,s were good. And alot of street driving JMO