Are you going to be at IRP NHRA regional race? We may be there with a BA/A trying to run 200 and in the 6s

I usually tap the center of the base plate 1/4 pipe thread and drill 100-125 hole in it for idle air and run solid butterflies. you have to mill a cross X it top side of the base plate so it can get some air from the throats
I find the carbs with the drilled throttle buterflies give too much air for street cars