Found some interesting things in another thread.
http://www.gearhead-efi.com/Fuel-Inj...ll=1#post19832

Maybe we can find out why? Could use someone with actual math skills as well as spreadsheet skills to apply what we find. I have plenty of starter spreadsheets but some are off, some are incomplete.

Here is what I found in hacks.

Code:
  
  TBI 5.7L 61 lb/hr = 61.2 lb/hr $0D states injector size is 61 lb/hr
 Val = 1461.5  * (VOL/RATE)
 VOL  = Vol of 1 Cylinder in liters, (0.7125L)
 RATE = Injector flow in gms/sec  5.7l = 7.71 gms/sec (61.2#/HR)
 (VOL/RATE) = 0.0924 l/gm/sec
 = BPW 135 set in $42 bin file and correct


 TBI 7.4L 76 lb/hr = 75.55 lb/hr
 Val = 1461.5  * (VOL/RATE)
 VOL  = Vol of 1 Cylinder in liters, (0.930L)
 RATE = Injector flow in gms/sec 7.4L = 9.52 gms/sec (75.55#/HR)
 (VOL/RATE) = 0.09768 l/gm/sec
 = BPW 142 set in $85 bin file and correct.


 TBI 7.4L 80 lb/hr = 80.50 lb/hr 
 Val = 1461.5  * (VOL/RATE)
 VOL  = Vol of 1 Cylinder in liters, (0.930L)
 RATE = Injector flow in gms/sec 7.4L = 10.144 gms/sec (80.50#/HR)
 (VOL/RATE) = 0.091679 l/gm/sec
 = BPW 134 set in $42 bin file and correct.