Don't know the total but couldn't have been many in the 2 squadrons; 63BS /43BG received 13 in Oct. 43 on N. Guinea and the 868BS was down to 12 with 13 crews in July 45 in the Phillipines (I think PFF by then).
STUDY 120 (p.200+) has the 868th formation but no mention of totals....
https://www.dafhistory.af.mil/Portal...090522-059.pdf
The SCR "A" radar in a B-24D / SB-24....
https://www.ibiblio.org/hyperwar/USN.../Radar-p70.jpg
Nick