+1, paired. Roots blower? 1-squirt will certainly run the engine, and quite well. For best (even) fuel distribution I would begin with 2 squirts per-cycle. The blower does a good job of being a blender
, so more squirts should not be necessary, but you can test for actual results of more squirts/cycle once up and running well on 1 or 2.
If it wasn't roots-blown (CSC or turbo with TB hat, etc), I'd say to wire injectors singly on 4 channels and 2 squirts (8 separate injections) for obvious reasons. Have fun!