for a std L8 ecu:

1) No

2) 4

it can be modified to run 8 injectors though with additional hardware from pectel or other.

my modified L8 can run 2 maps that can be swapped over with the flick of a switch and an 8 injector set up may be available later it can also run distributorless ignition, closed loop fuelling, ALS or many other options.