Holley 1945 carb direct replacement for a slant six? Ideas?

Thanks, Dan. Looks like the BBS in the photos has a solenoid attached to the side which my stock carb doesn't have. If I might ask, what would be the improvement of using the BBS over the Holley 1945? My Holley idles very poorly (and chugs) especially when the engine is fully warmed up. AFM set correctly, timing 10 degrees before. New plugs, wires, ECU, voltage regulator and ballast resistor. Runs fine at highway speed. Perhaps I'm barking up the wrong tree seeking to install a different carb. Not sure where to go from here. I like to keep everything stock if possible. Your opinion? Thanks.