OP combo is almost identical to mine. I ran an 830 DP for years with pretty good success. Last year I switched to a Holley 1000 HP Annular Booster carb. Every aspect of the way the car ran improved, both street and strip, with the exception of gas mileage. I don't really keep track of mileage, but I feel as though it was a notable difference in the "less MPG” direction. No question however that the cars throttle response improved. I attributed this primarily to the Annular boosters. At the track, which I'm primarily concerned with, I gained 2 tenths

I felt pretty good about my choice and results.