You don't really have to change anything other than the solenoids from block to block. The fuel and nitrous inlets just swap sides of the nozzle. Steve will have to answer the question on the E-brock nozzles, but i don't think they have one with the same config as the "B" nozzle either.
Edelbrock does have a 90 degree stainless steel nozzle you could use to replace the "B" nozzles with... But like most of the other options, you do need to swap the solenoid placement. The "B" nozzles are basically the odd ball with the nitrous and fuel opposite of about every other 90 degree nozzle. The reverseing of this was the reason for the internal tube in the "B" that will really be the cause of the end for this nozzle... Give a yell if I can help you with your set up.. thanks, Steve