48/56 might be first due here
If you listen to the dispatcher, there is additional info as the units are responding (now getting D2 as the apt., etc.) - contact is made to E75/L33, usually indicating 1st due units
75/33 used to be on Jerome and 183 St, so go out quarters to the left under da el and right on Fordham Road. That back then was a borderline box. Today 75/33 are on Walton south of 182 St, like your map shows, which makes it a longer run with more turns involved, especially Walton Ave is a south bound street. But any day at any time who knows who gonna get in first either now or thenAs an outsider to the Bronx, and knowing very little about its thoroughfares, from just looking at the map here it looks like 48/56 are much closer to the box. It’s actually a surprise to me that it’s a close call between them and 75/33.