So those are in the base plate? I just did a pair of 850's for a 588 BB Chevy in a boat and they referenced from the ported hole in the metering blocks w/hard line and no issues w/fuel that I could see and he said they flat out flew............

72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....